{"cik":750813,"entityName":"SEITEL INC","facts":{"dei":{"EntityCommonStockSharesOutstanding":{"label":"Entity Common Stock, Shares Outstanding","description":"Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.","units":{"shares":[{"end":"2011-08-08","val":100,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-11-07","val":100,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2012-03-07","val":100,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2012Q1I"},{"end":"2012-05-09","val":100,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2012-08-09","val":100,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-11-05","val":100,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2013-02-19","val":100,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2013-05-07","val":100,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-08-07","val":100,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-11-04","val":100,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2014-02-18","val":100,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2014-05-08","val":100,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-08-11","val":100,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-11-07","val":100,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2015-02-17","val":100,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2015-05-08","val":100,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-08-06","val":100,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-11-09","val":100,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2016-02-16","val":100,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2016-05-09","val":100,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-08-08","val":100,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-11-07","val":100,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2017-02-13","val":100,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-05-08","val":100,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-08-07","val":100,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-11-06","val":100,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2018-02-12","val":100,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"},{"end":"2018-05-07","val":100,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-08-09","val":100,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-11-05","val":100,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"EntityPublicFloat":{"label":"Entity Public Float","description":"The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter.","units":{"USD":[{"end":"2012-03-07","val":0,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2012Q1I"},{"end":"2013-02-19","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2013Q1I"},{"end":"2014-02-18","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2014Q1I"},{"end":"2015-02-17","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2015Q1I"},{"end":"2016-02-16","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2016Q1I"},{"end":"2017-02-13","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2018-02-12","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}}},"us-gaap":{"AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent":{"label":"Accounts Payable and Accrued Liabilities","description":"Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.","units":{"USD":[{"end":"2010-12-31","val":53170000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":53170000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q4I"},{"end":"2011-06-30","val":37066000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":30709000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":60550000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":60550000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":60550000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":60550000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":59420000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":41647000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":43464000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":62783000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":62783000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":62783000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":62783000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":62783000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":53122000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":38603000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":42954000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":37777000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":37777000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":37777000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":37777000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":37777000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":38159000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":36057000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":33912000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":34400000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":34400000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":34400000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":34400000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":34400000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":36092000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":32921000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":35897000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":23650000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":23650000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":23650000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":23650000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":23650000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":27626000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":21614000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":23261000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":17007000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":17007000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":17007000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":17007000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":17007000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":24786000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":16155000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":24675000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":20198000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":20198000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":20198000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":20198000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":18153000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":13840000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":23183000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"AccountsPayableCurrentAndNoncurrent":{"label":"Accounts Payable","description":"Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.","units":{"USD":[{"end":"2010-12-31","val":21013000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-12-31","val":36593000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":36593000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":37521000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":37521000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":23189000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":23189000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":18433000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":18433000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":8077000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":8077000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":2357000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":2357000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":6649000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"AccountsReceivableNet":{"label":"Accounts Receivable, after Allowance for Credit Loss","description":"Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.","units":{"USD":[{"end":"2010-12-31","val":34404000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":34404000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":34404000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":32290000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":48352000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":51306000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":51306000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":51306000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":51306000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":51306000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":52015000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":37405000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":44493000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":61195000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":61195000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":61195000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":61195000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":61195000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":43595000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":35195000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":40894000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":34616000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":34616000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":34616000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":34616000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":34616000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":42390000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":38925000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":36652000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":53250000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":53250000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":53250000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":53250000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":53250000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":21574000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":26456000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":18324000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":14830000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":14830000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":14830000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":14830000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":14830000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":7772000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":21694000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":6167000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":24481000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":24481000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":24481000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":24481000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":24481000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":24146000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":18281000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":12640000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":23330000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":23330000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":23330000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":23330000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":9686000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":9868000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":8676000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"AccruedIncomeTaxes":{"label":"Accrued Income Taxes","description":"Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes.","units":{"USD":[{"end":"2010-12-31","val":8000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":8000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":8000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":510000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":608000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":1464000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":1464000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":1464000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":1464000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":1464000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":2401000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":2176000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":3803000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":4134000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":4134000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":4134000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":4134000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":4134000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":972000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":546000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":612000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":787000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":787000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":787000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":787000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":787000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":2106000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":784000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":707000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":197000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":197000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":197000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":197000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":197000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":118000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":672000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":125000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-06-30","val":175000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":173000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":620000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":620000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":620000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":620000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":620000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":714000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":532000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":2519000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":2777000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":2777000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":2777000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":2777000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":52000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":33000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":41000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"AccruedLiabilitiesCurrentAndNoncurrent":{"label":"Accrued Liabilities","description":"Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities.","units":{"USD":[{"end":"2010-12-31","val":25588000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-12-31","val":16856000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":16856000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":19569000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":19569000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":12586000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":12586000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":12074000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":12074000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":14981000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":14981000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":10286000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":10286000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":10680000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment":{"label":"Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment","description":"Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.","units":{"USD":[{"end":"2010-12-31","val":9704000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":9704000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":9704000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":10955000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":11143000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":11882000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":11882000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":11882000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":11882000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":11882000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":12464000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":12725000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":13340000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":13461000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":13461000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":13461000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":13461000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":13461000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":13755000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":13989000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":14469000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":14432000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":14432000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":14432000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":14432000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":14432000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":14558000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":14913000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":14835000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":14971000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":14971000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":14971000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":14971000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":14971000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":14777000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":15090000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":15088000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":15147000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":15147000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":15147000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":15147000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":15147000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":15758000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":16033000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":16295000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":16478000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":16478000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":16478000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":16478000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":16478000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":16621000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":16880000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":17214000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":17346000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":17346000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":17346000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":17346000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":17337000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":17140000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":17367000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax":{"label":"Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax","description":"Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.","units":{"USD":[{"end":"2011-12-31","val":20800000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":23700000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":23721000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":13769000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":13800000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1700000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":1700000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":-19500000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":-19500000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":-16300000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":-16300000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":-8800000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"AccumulatedOtherComprehensiveIncomeLossNetOfTax":{"label":"Accumulated Other Comprehensive Income (Loss), Net of Tax","description":"Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.","units":{"USD":[{"end":"2010-12-31","val":26891000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":26891000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":26891000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":28681000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":17894000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":21014000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":21014000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":21014000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":21014000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":21014000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":23655000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":20413000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":25514000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":23721000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":23721000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":23721000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":23721000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":23721000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":20644000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":15569000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":18714000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":13769000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":13769000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":13769000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":13769000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":13769000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":8238000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":13193000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":6311000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":1688000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":1688000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":1688000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":1688000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":1688000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":-9700000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":-7774000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":-16029000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":-19523000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":-19523000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":-19523000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":-19523000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":-19523000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":-12779000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":-13087000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":-13948000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":-16333000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":-16333000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":-16333000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":-16333000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":-16333000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":-15511000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":-12942000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":-8190000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":-8807000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":-8807000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":-8807000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":-8807000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":-12003000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":-14372000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":-12633000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"AdditionalPaidInCapitalCommonStock":{"label":"Additional Paid in Capital, Common Stock","description":"Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.","units":{"USD":[{"end":"2010-12-31","val":277488000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":277488000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":277488000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":397900000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":397954000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":398011000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":398011000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":398011000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":398011000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":398011000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":398084000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":398329000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":398530000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":398772000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":398772000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":398772000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":398772000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":398772000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":398998000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":399270000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":399455000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":399641000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":399641000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":399641000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":399641000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":399641000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":399819000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":399945000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":400058000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":400177000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":400177000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":400177000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":400177000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":400177000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":400291000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":400374000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":400441000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":400505000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":400505000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":400505000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":400505000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":400505000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":400527000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":400581000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":400564000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":400582000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":400582000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":400582000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":400582000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":400582000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":400580000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":400588000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":400591000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":400592000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":400592000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":400592000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":400592000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":400594000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":400595000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":400596000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"AllowanceForDoubtfulAccountsReceivable":{"label":"Accounts Receivable, Allowance for Credit Loss","description":"Amount of allowance for credit loss on accounts receivable.","units":{"USD":[{"end":"2010-12-31","val":2556000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":2556000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":2556000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":1034000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":1043000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":1043000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":1043000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":1043000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":1043000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":1043000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":1044000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":1243000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":1052000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":737000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":737000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":737000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":737000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":737000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":352000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":332000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":332000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":332000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":332000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":332000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":332000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":332000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":444000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":449000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":269000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":268000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":268000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":268000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":268000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":268000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":267000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":267000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":264000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":267000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":267000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":267000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":267000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":267000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":241000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":241000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":228000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":223000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":223000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":223000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":223000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":223000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":223000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":178000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":178000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":176000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":176000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":176000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":176000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":175000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":175000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":176000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease":{"label":"Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)","description":"Amount of increase (decrease) in allowance for credit loss on accounts receivable.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":1524000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-06-30","val":6000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":6000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":12000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":12000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-06-30","val":-313000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":-313000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":-298000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":-298000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":-461000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":-461000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":-461000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":0,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":-300000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-300000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-300000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-224000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":-224000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":-337000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":-337000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":-337000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":-337000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":-337000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-337000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-337000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":0,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":0,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":0,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":0,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":0,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":4000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":4000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":4000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-06-30","val":-21000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":-21000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":-21000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":-21000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":-20000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-20000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-06-30","val":0,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-09-30","val":0,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"AllowanceForNotesReceivable":{"label":"Allowance for Notes, Loans and Financing Receivable (Deprecated 2012-01-31)","description":"For an unclassified balance sheet, the valuation allowance relating to a written agreement to receive money (at a specified future date(s), consisting of principal as well as any accrued interest) for the portion that is expected to be uncollectible.","units":{"USD":[{"end":"2010-12-31","val":0,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2010-12-31","val":0,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2011-06-30","val":1501000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":1501000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":1501000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":1501000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q4I"},{"end":"2012-03-31","val":1501000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"}]}},"AmortizationOfAboveAndBelowMarketLeases":{"label":"Amortization of above and below Market Leases","description":"Amount of non-cash amortization of intangible asset (liability) for above and below market leases.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":276000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":290000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":290000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":72000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":142000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":214000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":393000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":393000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":393000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":0,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014"}]}},"AmortizationOfDebtDiscountPremium":{"label":"Amortization of Debt Discount (Premium)","description":"Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-93000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":-48000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":-73000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":-98000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":-98000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":-26000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":-56000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":-56000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":-56000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-56000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":-56000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":-56000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":-56000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013"}]}},"AmortizationOfFinancingCosts":{"label":"Amortization of Debt Issuance Costs","description":"Amount of amortization expense attributable to debt issuance costs.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":1832000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":854000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":1297000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":1753000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":1753000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":516000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":1044000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":1044000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":1518000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":1518000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":1999000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":1999000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":1999000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":492000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":492000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":997000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":997000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":1514000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":1514000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":2044000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":2044000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":2044000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":502000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":502000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":739000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":739000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":989000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":989000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":1246000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":1246000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":1246000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":262000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":262000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":532000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":532000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":808000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":808000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":1090000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":1090000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":1090000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":289000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":289000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":585000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":585000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":889000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":889000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":1200000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":1200000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":1200000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":318000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":318000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":628000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":628000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":922000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":922000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":1224000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":1224000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":310000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":310000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":627000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":627000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":952000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":952000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":1285000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":342000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":692000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":1052000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"AmortizationOfIntangibleAssets":{"label":"Amortization of Intangible Assets","description":"The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":252000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":137000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":206000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":276000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":6000000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":73000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":147000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":147000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":219000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":219000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":290000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":6100000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":6100000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":72000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":142000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-09-30","val":214000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-12-31","val":6200000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":6200000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":6200000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":5700000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":5700000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":5700000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":4500000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":4500000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":4500000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":4200000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":4200000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":4200000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":4200000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":4200000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":500000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"AssetImpairmentCharges":{"label":"Asset Impairment Charges","description":"Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":0,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":0,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":0,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":0,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":0,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":0,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":0,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":0,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":0,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":0,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":0,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":0,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":0,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":0,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":0,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":0,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":0,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":0,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":0,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":0,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":0,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":0,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":0,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":0,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":0,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":0,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":0,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"Assets":{"label":"Assets","description":"Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.","units":{"USD":[{"end":"2010-12-31","val":491009000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":491009000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":491009000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":588224000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":454620000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":500330000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":500330000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":500330000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":500330000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":500330000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":518331000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":500205000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":502078000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":550744000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":550744000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":550744000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":550744000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":550744000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":510585000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":493390000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":503816000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":595513000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":595513000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":595513000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":595513000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":595513000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":582583000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":580971000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":577157000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":579756000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":579756000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":579756000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":579756000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":579756000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":559131000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":558116000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":534368000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":425791000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":421487000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":421487000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":421487000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":421487000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":415610000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":401410000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":390572000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":385171000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":385171000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":385171000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":385171000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":385171000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":382359000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":361649000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":370019000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":364048000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":364048000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":364048000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":364048000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":353925000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":339836000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":343582000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"AvailableForSaleSecurities":{"label":"Available-for-sale Securities","description":"Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.","units":{"USD":[{"end":"2011-12-31","val":262000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"}]}},"AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments":{"label":"Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments","description":"This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":4188000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":2467000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":2467000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-06-30","val":230000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":230000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":230000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":230000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":230000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":230000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014"}]}},"AvailableforsaleSecuritiesGrossUnrealizedGain":{"label":"Available-for-sale Securities, Gross Unrealized Gains (Deprecated 2013-01-31)","description":"This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.","units":{"USD":[{"end":"2011-12-31","val":300000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"}]}},"CapitalizedContractCostNet":{"label":"Capitalized Contract Cost, Net","description":"Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.","units":{"USD":[{"end":"2017-12-31","val":200000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":200000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":200000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":200000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":300000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":200000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"CapitalLeaseObligations":{"label":"Capital Lease Obligations","description":"Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.","units":{"USD":[{"end":"2010-12-31","val":3394000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":3394000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":3394000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":3419000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":3134000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":3161000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":3161000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":3161000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":3161000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":3161000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":3176000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":3160000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":3210000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":3113000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":3113000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":3113000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":3113000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":3113000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":2990000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":2831000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":2829000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":2676000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":2676000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":2676000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":2676000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":2676000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":2516000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":2540000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":2359000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":2219000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":2219000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":2219000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":2219000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":2219000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":1974000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":1948000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":1765000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":1661000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":1661000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":1661000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":1661000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":1661000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":1721000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":1664000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":1599000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":1510000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":1510000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":1510000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":1510000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":1510000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":1469000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":1443000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":1438000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":1363000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":1363000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":1363000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":1363000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":1259000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":1166000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":1117000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"CapitalLeaseObligationsIncurred":{"label":"Lease Obligation Incurred","description":"Amount of increase in lease obligation from new lease.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-06-30","val":94000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":94000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":95000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":95000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":95000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":95000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":95000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014"}]}},"CapitalLeasesFutureMinimumPaymentsDue":{"label":"Capital Leases, Future Minimum Payments Due","description":"Amount of minimum lease payments for capital leases.","units":{"USD":[{"end":"2012-12-31","val":4144000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":3462000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":2791000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":2029000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":1786000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":1563000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueCurrent":{"label":"Capital Leases, Future Minimum Payments Due, Next Twelve Months","description":"Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":446000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":420000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":371000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":296000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":326000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":361000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueInFiveYears":{"label":"Capital Leases, Future Minimum Payments Due in Five Years","description":"Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":440000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":425000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":390000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":327000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":337000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":120000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueInFourYears":{"label":"Capital Leases, Future Minimum Payments Due in Four Years","description":"Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":412000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":412000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":390000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":327000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":337000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":360000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueInThreeYears":{"label":"Capital Leases, Future Minimum Payments Due in Three Years","description":"Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":430000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":385000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":378000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":327000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":337000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":361000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueInTwoYears":{"label":"Capital Leases, Future Minimum Payments Due in Two Years","description":"Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":446000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":403000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":353000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":316000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":337000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":361000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueThereafter":{"label":"Capital Leases, Future Minimum Payments Due Thereafter","description":"Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":1970000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":1417000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":909000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":436000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":112000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments":{"label":"Capital Leases, Future Minimum Payments, Interest Included in Payments","description":"Amount necessary to reduce net minimum lease payments to present value for capital leases.","units":{"USD":[{"end":"2012-12-31","val":1031000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":786000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":572000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":368000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":276000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":200000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments":{"label":"Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments","description":"Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.","units":{"USD":[{"end":"2012-12-31","val":3113000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":2676000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":2219000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":1661000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":1510000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":1363000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"CashAndCashEquivalentsAtCarryingValue":{"label":"Cash and Cash Equivalents, at Carrying Value","description":"Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.","units":{"USD":[{"end":"2008-12-31","val":42678000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2008Q4I"},{"end":"2009-12-31","val":26270000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2009-12-31","val":26270000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2009-12-31","val":26270000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2009-12-31","val":26270000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2009Q4I"},{"end":"2010-06-30","val":41268000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2I"},{"end":"2010-09-30","val":45623000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3I"},{"end":"2010-12-31","val":89971000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":89971000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":89971000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2010-12-31","val":89971000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2010-12-31","val":89971000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2010-12-31","val":89971000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2010-12-31","val":89971000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2010-12-31","val":89971000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2010Q4I"},{"end":"2011-03-31","val":67690000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1I"},{"end":"2011-06-30","val":173370000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2011-06-30","val":173370000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2I"},{"end":"2011-09-30","val":38607000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2011-09-30","val":38607000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3I"},{"end":"2011-12-31","val":74894000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":74894000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":74894000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":74894000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":74894000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2011-12-31","val":74894000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2011-12-31","val":74894000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2011-12-31","val":74894000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2011-12-31","val":74894000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2011-12-31","val":74894000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2011Q4I"},{"end":"2012-03-31","val":63415000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2012-03-31","val":63415000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1I"},{"end":"2012-06-30","val":59575000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2012-06-30","val":59575000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2I"},{"end":"2012-09-30","val":42819000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2012-09-30","val":42819000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3I"},{"end":"2012-12-31","val":61891000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":61891000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":61891000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":61891000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":61891000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2012-12-31","val":61891000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2012-12-31","val":61891000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2012-12-31","val":61891000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2012-12-31","val":61891000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2012-12-31","val":61891000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2012Q4I"},{"end":"2013-03-31","val":25544000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2013-03-31","val":25544000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1I"},{"end":"2013-06-30","val":25183000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2013-06-30","val":25183000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2013Q2I"},{"end":"2013-09-30","val":28040000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2013-09-30","val":28040000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":31353000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":31353000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":31353000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":31353000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":31353000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2013-12-31","val":31353000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2013-12-31","val":31353000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2013-12-31","val":31353000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2013-12-31","val":31353000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2013-12-31","val":31353000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2013Q4I"},{"end":"2014-03-31","val":33146000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2014-03-31","val":33146000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":43017000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2014-06-30","val":43017000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2014Q2I"},{"end":"2014-09-30","val":56581000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2014-09-30","val":56581000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":59175000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":59175000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":59175000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":59175000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":59175000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2014-12-31","val":59175000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2014-12-31","val":59175000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2014-12-31","val":59175000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2014-12-31","val":59175000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2014-12-31","val":59175000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2014Q4I"},{"end":"2015-03-31","val":80106000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2015-03-31","val":80106000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1I"},{"end":"2015-06-30","val":66692000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2015-06-30","val":66692000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":63974000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2015-09-30","val":63974000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q3I"},{"end":"2015-12-31","val":52675000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":52675000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":52675000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":52675000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":52675000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2015-12-31","val":52675000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2015-12-31","val":52675000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2015-12-31","val":52675000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2015-12-31","val":52675000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":57035000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2016-03-31","val":57035000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1I"},{"end":"2016-06-30","val":44473000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2016-06-30","val":44473000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2016Q2I"},{"end":"2016-09-30","val":60874000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2016-09-30","val":60874000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2016Q3I"},{"end":"2016-12-31","val":55997000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":55997000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":55997000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":55997000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":55997000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2016-12-31","val":55997000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2016-12-31","val":55997000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2016-12-31","val":55997000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2016Q4I"},{"end":"2017-03-31","val":64251000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2017-03-31","val":64251000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1I"},{"end":"2017-06-30","val":60843000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2017-06-30","val":60843000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2I"},{"end":"2017-09-30","val":80273000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2017-09-30","val":80273000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3I"},{"end":"2017-12-31","val":70581000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":70581000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":70581000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":70581000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":80974000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":75153000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":81521000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"CashAndCashEquivalentsPeriodIncreaseDecrease":{"label":"Cash and Cash Equivalents, Period Increase (Decrease)","description":"Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-16408000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":14998000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":19353000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":63701000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":63701000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":-22281000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":83399000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":83399000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":-51364000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-51364000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":-15077000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":-15077000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-15077000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":-11479000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":-11479000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-15319000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":-15319000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":-32075000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":-32075000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":-13003000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":-13003000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":-13003000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-36347000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":-36347000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":-36708000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":-36708000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":-33851000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":-33851000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":-30538000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-30538000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-30538000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":1793000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":1793000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":11664000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":11664000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":25228000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":25228000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":27822000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":27822000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":27822000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":20931000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":20931000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":7517000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":7517000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":4799000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":4799000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":-6500000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-6500000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-6500000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":4360000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":4360000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":-8202000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":-8202000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":8199000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":8199000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":3322000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":3322000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":8254000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":8254000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":4846000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":4846000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":24276000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":24276000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":14584000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":10393000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":4572000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":10940000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"CommonStockParOrStatedValuePerShare":{"label":"Common Stock, Par or Stated Value Per Share","description":"Face amount or stated value per share of common stock.","units":{"USD/shares":[{"end":"2010-12-31","val":0.001,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":0.001,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":0.001,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":0.001,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":0.001,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":0.001,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":0.001,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":0.001,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":0.001,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":0.001,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":0.001,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":0.001,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":0.001,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":0.001,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":0.001,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":0.001,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":0.001,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":0.001,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":0.001,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":0.001,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":0.001,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":0.001,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":0.001,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":0.001,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":0.001,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":0.001,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":0.001,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":0.001,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":0.001,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":0.001,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":0.001,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":0.001,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":0.001,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":0.001,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":0.001,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":0.001,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":0.001,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":0.001,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":0.001,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":0.001,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":0.001,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":0.001,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":0.001,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":0.001,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":0.001,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":0.001,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":0.001,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":0.001,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":0.001,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":0.001,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":0.001,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":0.001,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":0.001,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":0.001,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":0.001,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":0.001,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":0.001,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":0.001,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":0.001,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":0.001,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"CommonStockSharesAuthorized":{"label":"Common Stock, Shares Authorized","description":"The maximum number of common shares permitted to be issued by an entity's charter and bylaws.","units":{"shares":[{"end":"2010-12-31","val":100,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":100,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":100,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":100,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":100,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":100,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":100,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":100,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":100,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":100,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":100,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":100,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":100,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":100,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":100,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":100,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":100,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":100,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":100,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":100,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":100,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":100,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":100,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":100,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":100,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":100,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":100,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":100,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":100,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":100,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":100,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":100,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":100,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":100,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":100,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":100,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":100,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":100,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":100,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":100,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":100,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":100,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":100,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":100,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":100,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":100,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":100,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":100,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":100,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":100,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":100,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":100,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":100,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":100,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":100,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":100,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":100,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":100,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":100,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":100,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"CommonStockSharesIssued":{"label":"Common Stock, Shares, Issued","description":"Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.","units":{"shares":[{"end":"2010-12-31","val":100,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":100,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":100,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":100,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":100,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":100,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":100,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":100,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":100,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":100,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":100,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":100,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":100,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":100,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":100,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":100,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":100,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":100,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":100,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":100,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":100,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":100,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":100,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":100,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":100,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":100,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":100,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":100,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":100,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":100,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":100,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":100,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":100,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":100,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":100,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":100,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":100,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":100,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":100,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":100,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":100,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":100,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":100,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":100,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":100,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":100,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":100,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":100,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":100,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":100,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":100,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":100,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":100,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":100,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":100,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":100,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":100,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":100,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":100,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":100,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"CommonStockSharesOutstanding":{"label":"Common Stock, Shares, Outstanding","description":"Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.","units":{"shares":[{"end":"2010-12-31","val":100,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":100,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":100,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":100,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":100,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":100,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":100,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":100,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":100,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":100,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":100,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":100,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":100,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":100,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":100,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":100,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":100,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":100,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":100,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":100,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":100,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":100,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":100,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":100,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":100,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":100,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":100,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":100,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":100,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":100,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":100,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":100,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":100,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":100,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":100,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":100,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":100,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":100,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":100,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":100,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":100,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":100,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":100,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":100,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":100,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":100,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":100,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":100,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":100,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":100,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":100,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":100,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":100,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":100,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":100,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":100,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":100,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":100,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":100,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":100,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"CommonStockValue":{"label":"Common Stock, Value, Issued","description":"Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.","units":{"USD":[{"end":"2011-12-31","val":0,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":0,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":0,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":0,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":0,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":0,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":0,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":0,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":0,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":0,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":0,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":0,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":0,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":0,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":0,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":0,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":0,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":0,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"ComprehensiveIncomeNetOfTax":{"label":"Comprehensive Income (Loss), Net of Tax, Attributable to Parent","description":"Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":-46403000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":-29390000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":-55566000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":-9163000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":-56540000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":3138000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":-2725000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":-2725000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":-5863000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":-5863000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":-18623000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-18623000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":-15898000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":-15898000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":-3661000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-3661000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":17347000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":17347000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":15375000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":15375000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":-1972000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":-1972000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":21605000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":21605000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":6230000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":6230000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":39757000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":39757000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":39757000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-1339000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":-1339000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":-46000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":-46000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":1293000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":1293000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":3336000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":3336000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":3382000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":3382000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":103729000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":103729000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":103729000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-3639000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":-3639000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":3891000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":3891000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":7530000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":7530000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":1495000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":1495000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":-2396000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":-2396000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":-2403000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-2403000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-2403000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-19034000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-19034000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-19384000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-19384000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":-350000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":-350000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":-31694000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-31694000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":-12310000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-07-01","end":"2015-09-30","val":-12310000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":-131201000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-131201000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-131201000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":-7120000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":-7120000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":-16663000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":-16663000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":-9543000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":-9543000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":-22967000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":-22967000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":-6304000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":-6304000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":-21234000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-21234000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":-12557000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":-12557000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-19624000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":-19624000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":-7067000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-04-01","end":"2017-06-30","val":-7067000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":-21216000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":-21216000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":-1592000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-07-01","end":"2017-09-30","val":-1592000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":-23955000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":-5099000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-17279000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":-12180000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":-20260000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":-2981000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"ContractWithCustomerLiability":{"label":"Contract with Customer, Liability","description":"Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.","units":{"USD":[{"end":"2017-12-31","val":13095000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":13095000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":13095000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":12865000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":15186000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":15802000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized":{"label":"Contract with Customer, Liability, Change in Timeframe, Performance Obligation Satisfied, Revenue Recognized","description":"Amount of revenue recognized arising from contract liability from change in timeframe for performance obligation to be satisfied.","units":{"USD":[{"start":"2018-01-01","end":"2018-03-31","val":100000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"}]}},"ContractWithCustomerLiabilityRevenueRecognized":{"label":"Contract with Customer, Liability, Revenue Recognized","description":"Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.","units":{"USD":[{"start":"2017-01-01","end":"2017-03-31","val":1100000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":6100000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":6500000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-01-01","end":"2018-03-31","val":2200000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":2600000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":3700000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"CostOfRevenue":{"label":"Cost of Revenue","description":"The aggregate cost of goods produced and sold and services rendered during the reporting period.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":290000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":63000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":26000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":73000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":10000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":97000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":97000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":16000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":55000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":55000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":39000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":39000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":68000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":68000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":13000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":13000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":100000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":100000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":100000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":97000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":97000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":248000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":248000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":151000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":151000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":352000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":352000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":104000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":104000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":464000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":464000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":464000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":39000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":39000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":102000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":102000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":63000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":63000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":290000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":290000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":188000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":188000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":475000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":475000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":475000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":126000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":126000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":253000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":253000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":127000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":127000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":282000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":282000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":29000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":29000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":304000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":304000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":304000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":100000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":100000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":127000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":127000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":27000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":27000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":164000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":164000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":37000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-07-01","end":"2015-09-30","val":37000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":195000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":195000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":195000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":22000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":22000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":33000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":33000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":11000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":11000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":55000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":55000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":22000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":22000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":76000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":76000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":10000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":10000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":43000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":43000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":33000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-04-01","end":"2017-06-30","val":33000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":74000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":74000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":31000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-07-01","end":"2017-09-30","val":31000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":96000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":17000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":105000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":88000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":112000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":7000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"CurrentFederalTaxExpenseBenefit":{"label":"Current Federal Tax Expense (Benefit)","description":"Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":342000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":342000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":342000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":69000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":69000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":69000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":334000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":334000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":334000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-4000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-4000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-4000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"CurrentForeignTaxExpenseBenefit":{"label":"Current Foreign Tax Expense (Benefit)","description":"Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":45000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":1394000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":1394000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":4125000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":4125000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":4125000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-5184000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-5184000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-5184000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":65000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":65000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":65000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":465000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":465000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":2917000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"CurrentIncomeTaxExpenseBenefit":{"label":"Current Income Tax Expense (Benefit)","description":"Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":45000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":681000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":681000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":5560000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":5560000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":5560000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-3077000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-3077000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-3077000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":1020000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":1020000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":1020000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":193000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":193000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":193000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":561000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":561000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":2943000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"CurrentStateAndLocalTaxExpenseBenefit":{"label":"Current State and Local Tax Expense (Benefit)","description":"Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-713000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-713000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":1093000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":1093000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":1093000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":2038000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":2038000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":2038000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":686000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":686000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":686000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":132000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":132000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":132000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":96000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":96000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":26000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"DebtInstrumentFaceAmount":{"label":"Debt Instrument, Face Amount","description":"Face (par) amount of debt instrument at time of issuance.","units":{"USD":[{"end":"2011-12-31","val":275100000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q4I"},{"end":"2011-12-31","val":275100000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2012-06-30","val":275100000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":275000000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"}]}},"DebtInstrumentFairValue":{"label":"Debt Instrument, Fair Value Disclosure","description":"Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.","units":{"USD":[{"end":"2011-12-31","val":273000000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q4I"},{"end":"2011-12-31","val":273000000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2012-06-30","val":278500000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":281100000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"}]}},"DebtLongtermAndShorttermCombinedAmount":{"label":"Debt, Long-term and Short-term, Combined Amount","description":"Represents the aggregate of total long-term debt, including current maturities and short-term debt.","units":{"USD":[{"end":"2011-12-31","val":275095000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":275095000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-09-30","val":275046000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":275029000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":275029000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":275029000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":275029000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":275029000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":250012000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":250000000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":250000000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":250000000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":250000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":250000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":250000000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":250000000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":250000000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":250000000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":250000000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":250000000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":250000000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":250000000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":250000000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":250000000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"}]}},"DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible":{"label":"Decrease in Unrecognized Tax Benefits is Reasonably Possible","description":"Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.","units":{"USD":[{"end":"2016-06-30","val":1400000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":200000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"}]}},"DeferredFederalIncomeTaxExpenseBenefit":{"label":"Deferred Federal Income Tax Expense (Benefit)","description":"Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":-369000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-1000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-1000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-90827000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-90827000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-90827000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":10241000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":10241000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":10241000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":80586000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":80586000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":80586000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":-2357000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"DeferredFinanceCostsNet":{"label":"Debt Issuance Costs, Net","description":"Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.","units":{"USD":[{"end":"2015-12-31","val":4304000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":4304000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":4304000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":4304000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":4025000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":3738000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":3444000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":3143000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":3143000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":3143000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":3143000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":3143000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":2833000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":2516000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":2191000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":1858000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":1858000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":1858000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":1858000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":1516000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":1166000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":806000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"DeferredForeignIncomeTaxExpenseBenefit":{"label":"Deferred Foreign Income Tax Expense (Benefit)","description":"Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":-3685000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-558000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-558000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":1250000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":1250000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":1250000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":5564000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":5564000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":5564000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":-1494000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-1494000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-1494000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-1993000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-1993000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-1993000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":-3904000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-3904000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":-1312000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"DeferredIncomeTaxExpenseBenefit":{"label":"Deferred Income Tax Expense (Benefit)","description":"Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-2924000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":-1967000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":-3485000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":-4053000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":-4053000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":205000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":429000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":429000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":-394000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-394000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":-289000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":-289000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-289000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":1065000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":1065000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":760000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":760000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":213000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":213000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":1222000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":1222000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":1222000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":523000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":523000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":2681000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":2681000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":149000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":149000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":-86863000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-86863000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-86863000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":631000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":631000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":3047000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":3047000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":7430000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":7430000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":9273000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":9273000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":9273000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-5374000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-5374000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-4822000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-4822000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":-5704000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-5704000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":79712000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":79712000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":79712000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":-1445000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":-1445000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":-3703000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":-3703000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":-5127000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":-5127000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":-3957000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-3957000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":-612000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":-612000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-585000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":-585000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":-1172000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":-1172000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":-3628000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":-411000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-977000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":-1272000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"DeferredIncomeTaxLiabilities":{"label":"Deferred Tax Liabilities, Gross","description":"Amount of deferred tax liability attributable to taxable temporary differences.","units":{"USD":[{"end":"2010-12-31","val":2128000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":2128000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":2128000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":2462000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":1635000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":1375000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":1375000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":1375000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":1375000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":9951000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":2420000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":2021000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":1499000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":9963000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":9963000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":14219000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":14219000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":11555000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":11555000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":6167000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":6167000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":3940000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":3940000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":2103000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DeferredRevenue":{"label":"Deferred Revenue","description":"Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.","units":{"USD":[{"end":"2010-12-31","val":37121000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":37121000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":37121000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":33977000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":48603000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":48845000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":48845000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":48845000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":48845000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":48845000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":48575000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":50605000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":43092000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":52857000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":52857000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":52857000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":52857000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":52857000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":51348000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":45691000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":50677000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":41739000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":41739000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":41739000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":41739000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":41739000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":31909000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":25835000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":27439000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":34517000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":34517000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":34517000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":34517000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":34517000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":32435000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":34085000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":21250000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":25903000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":25903000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":25903000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":25903000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":25903000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":24133000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":24503000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":18673000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":15904000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":15904000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":15904000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":15904000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":15904000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":18078000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":12914000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":12176000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":13095000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DeferredStateAndLocalIncomeTaxExpenseBenefit":{"label":"Deferred State and Local Income Tax Expense (Benefit)","description":"Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":1000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":270000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":270000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":-28000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":-28000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":-28000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-1600000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-1600000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-1600000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":526000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":526000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":526000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":1119000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":1119000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":1119000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":-53000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-53000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":41000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"DeferredTaxAssetsDeferredIncome":{"label":"Deferred Tax Assets, Deferred Income","description":"Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.","units":{"USD":[{"end":"2011-12-31","val":2158000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":1044000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":1044000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":1932000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":1932000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":716000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":716000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":655000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":655000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":2115000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":2115000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":1808000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DeferredTaxAssetsGross":{"label":"Deferred Tax Assets, Gross","description":"Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.","units":{"USD":[{"end":"2011-12-31","val":116698000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":108069000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":108069000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":99152000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":99152000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":87965000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":87965000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":92582000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":92582000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":97395000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":97395000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":62010000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DeferredTaxAssetsLiabilitiesNet":{"label":"Deferred Tax Assets, Net","description":"Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.","units":{"USD":[{"end":"2012-12-31","val":-2386000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":84933000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":84933000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":76410000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"}]}},"DeferredTaxAssetsNet":{"label":"Deferred Tax Assets, Net of Valuation Allowance","description":"Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.","units":{"USD":[{"end":"2010-12-31","val":326000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":326000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":326000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":326000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":326000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":56000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":56000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":56000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":56000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q4I"},{"end":"2012-03-31","val":56000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":56000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":56000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":5900000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":84000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":92511000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":92511000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":92511000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":92511000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":92511000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":91033000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":88655000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":83881000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":81744000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":81744000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":81744000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":81744000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":81744000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":86624000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":86286000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":86607000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":39000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":39000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":39000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":39000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":39000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":66000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":59000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":71000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":257000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":257000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":257000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":257000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":257000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":292000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":272000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":284000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":203000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":203000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":203000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":203000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":201000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":219000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":233000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"DeferredTaxAssetsOperatingLossCarryforwards":{"label":"Deferred Tax Assets, Operating Loss Carryforwards","description":"Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.","units":{"USD":[{"end":"2011-12-31","val":84413000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":75873000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":75873000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":73246000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":73246000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":67148000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":67148000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":71330000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":71330000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":74656000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":74656000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":50353000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax":{"label":"Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax","description":"Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.","units":{"USD":[{"end":"2011-12-31","val":1782000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":2124000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":2124000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":2194000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":2194000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":2527000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":2527000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":2523000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":2523000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":2523000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":2523000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-22","val":2500000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":167000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DeferredTaxAssetsTaxCreditCarryforwardsResearch":{"label":"Deferred Tax Assets, Tax Credit Carryforwards, Research","description":"Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.","units":{"USD":[{"end":"2011-12-31","val":1055000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":1078000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":1078000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":1236000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":1236000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1133000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":1133000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":566000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":566000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"}]}},"DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals":{"label":"Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals","description":"Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals.","units":{"USD":[{"end":"2011-12-31","val":8349000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":8572000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":8572000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":8889000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":8889000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":8153000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":8153000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":8211000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":8211000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":7891000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":7891000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":2328000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DeferredTaxAssetsValuationAllowance":{"label":"Deferred Tax Assets, Valuation Allowance","description":"Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.","units":{"USD":[{"end":"2010-12-31","val":107490000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010Q4I"},{"end":"2011-12-31","val":108066000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2011-12-31","val":108066000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011Q4I"},{"end":"2012-12-31","val":100492000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":100492000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2012-12-31","val":100492000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2013-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014Q4I"},{"end":"2015-12-31","val":88737000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":88737000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2015-12-31","val":88737000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":95412000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":95412000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":61063000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DeferredTaxLiabilities":{"label":"Deferred Tax Liabilities, Net","description":"Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.","units":{"USD":[{"end":"2011-12-31","val":1319000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":2386000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":2470000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":7578000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":7578000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":7578000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":7578000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":7578000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":6398000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":6604000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":5872000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":5334000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":5334000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":5334000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":5334000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":5334000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":4343000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":4588000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":3672000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":2361000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":2361000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":2361000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":2361000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":2361000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":1037000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":1563000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":1002000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":2214000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":2214000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":2214000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":2214000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":2214000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":1645000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":1680000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":1550000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":1359000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":1359000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":1359000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":1359000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":904000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":748000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":880000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"DeferredTaxLiabilitiesDeferredExpense":{"label":"Deferred Tax Liabilities, Deferred Expense","description":"Amount of deferred tax liability attributable to taxable temporary differences from capitalized costs.","units":{"USD":[{"end":"2011-12-31","val":571000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":577000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":577000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":521000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":521000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":409000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":409000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":127000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":127000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":138000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":138000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":129000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets":{"label":"Deferred Tax Liabilities, Intangible Assets","description":"Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.","units":{"USD":[{"end":"2011-12-31","val":8315000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":6595000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":6595000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":4784000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":4784000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":3276000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":3276000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":1854000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":1854000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":487000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":487000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":189000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DeferredTaxLiabilitiesOtherComprehensiveIncome":{"label":"Deferred Tax Liabilities, Other Comprehensive Income","description":"Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains in other comprehensive income.","units":{"USD":[{"end":"2011-12-31","val":92000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"}]}},"DeferredTaxLiabilitiesPropertyPlantAndEquipment":{"label":"Deferred Tax Liabilities, Property, Plant and Equipment","description":"Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.","units":{"USD":[{"end":"2011-12-31","val":973000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":2791000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"}]}},"DefinedContributionPlanCostRecognized":{"label":"Defined Contribution Plan, Cost","description":"Amount of cost for defined contribution plan.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":400000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":500000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":500000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":500000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":526000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":500000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":507000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":500000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":500000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":500000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":500000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":500000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":500000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":500000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":500000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":400000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":400000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":700000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"Depreciation":{"label":"Depreciation","description":"The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":2100000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":2200000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":2200000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":1100000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":1100000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":1100000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":1000000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":1000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":1000000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":1000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":1000000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":1000000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":900000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":900000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":900000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":700000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":700000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":500000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"DepreciationAndAmortization":{"label":"Depreciation, Depletion and Amortization, Nonproduction","description":"The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":150199000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":76767000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":38111000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":121788000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":45021000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":175592000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":175592000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":42414000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":65660000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":65660000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":23246000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":23246000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":99712000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":99712000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":34052000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":34052000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":142963000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":142963000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":142963000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":39384000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":39384000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":69221000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":69221000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":29837000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":29837000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":106924000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":106924000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":37703000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":37703000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":139754000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":139754000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":139754000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":29338000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":29338000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":57167000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":57167000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":27829000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":27829000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":89252000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":89252000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":32085000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":32085000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":121598000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":121598000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":121598000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":37858000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":37858000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":67629000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":67629000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":29771000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":29771000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":85938000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":85938000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":18309000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":18309000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":121023000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":121023000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":121023000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":23080000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":23080000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":43487000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":43487000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":20407000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":20407000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":68114000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":68114000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":24627000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-07-01","end":"2015-09-30","val":24627000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":80923000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":80923000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":80923000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":15101000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":15101000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":39906000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":39906000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":24805000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":24805000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":58839000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":58839000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":18933000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":18933000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":75078000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":75078000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":22263000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":22263000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":44232000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":44232000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":21969000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-04-01","end":"2017-06-30","val":21969000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":61946000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":61946000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":17714000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-07-01","end":"2017-09-30","val":17714000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":77482000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":10311000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":18392000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":8081000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":28522000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":10130000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"DividendsCommonStockCash":{"label":"Dividends, Common Stock, Cash","description":"Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.","units":{"USD":[{"start":"2018-01-01","end":"2018-09-30","val":3700000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"DueFromRelatedParties":{"label":"Due from Related Parties","description":"For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.","units":{"USD":[{"end":"2010-12-31","val":156000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":156000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":156000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":162000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":858000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":861000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":861000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":861000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":861000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":861000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":865000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":870000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":872000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":874000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":874000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":874000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":874000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":874000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":1120000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":1125000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":1127000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":1130000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":1130000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":1130000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":1130000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":1130000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":1133000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":1137000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":1140000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":1143000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":1143000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":1143000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":1143000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":1143000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":1146000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":1151000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":1153000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":1156000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":1156000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":1156000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":1156000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":1156000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":1167000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":1172000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":1175000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":1177000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":1177000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":1177000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":1177000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":1177000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":1180000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":1185000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":1188000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":1191000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":1191000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":1191000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":1191000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":1193000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":1198000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":0,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"EarlyRepaymentOfSeniorDebt":{"label":"Early Repayment of Senior Debt","description":"The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.","units":{"USD":[{"start":"2011-01-01","end":"2011-09-30","val":131094000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":131094000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":131094000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2011"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"}]}},"EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate":{"label":"Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent","description":"Percentage of domestic federal statutory tax rate applicable to pretax income (loss).","units":{"pure":[{"start":"2010-01-01","end":"2010-12-31","val":0.35,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":0.35,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":0.35,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0.35,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":0.35,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0.35,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":0.35,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0.35,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":0.35,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0.35,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0.35,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":0.35,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0.35,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":0.35,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":0.35,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0.35,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":0.35,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":0.35,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-12-31","val":0.21,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2018"}]}},"EffectOfExchangeRateOnCashAndCashEquivalents":{"label":"Effect of Exchange Rate on Cash and Cash Equivalents","description":"Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-807000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":224000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":121000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":372000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":813000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":-4000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":-188000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":-188000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":978000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":978000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":697000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":-29000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-29000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":-240000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":171000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":202000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":187000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":-857000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":179000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":153000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":153000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":153000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-144000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":-144000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":-262000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":-262000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":-186000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":-186000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":-453000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-453000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-453000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-155000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":-155000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":122000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":122000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":-249000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":-249000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":-618000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-618000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-618000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-1065000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-1065000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-1000000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-1000000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":-1128000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-1128000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":-1192000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-1192000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-1192000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":177000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":177000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":156000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":156000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":96000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":96000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":-47000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-47000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":60000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":60000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":460000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":460000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":1061000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":1061000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":1010000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":-46000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-112000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":-72000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"EmployeeRelatedLiabilitiesCurrentAndNoncurrent":{"label":"Employee-related Liabilities","description":"Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits.","units":{"USD":[{"end":"2010-12-31","val":6569000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-12-31","val":7101000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":7101000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":5693000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":5693000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":2002000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":2002000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":3893000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":3893000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":592000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":592000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":4364000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":4364000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":2869000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions":{"label":"Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options (Deprecated 2017-01-31)","description":"Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.","units":{"USD":[{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense":{"label":"Share-based Payment Arrangement, Expense, Tax Benefit","description":"Amount of tax benefit for recognition of expense of award under share-based payment arrangement.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":200000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"EquityMethodInvestmentRealizedGainLossOnDisposal":{"label":"Equity Method Investment, Realized Gain (Loss) on Disposal","description":"Amount of gain (loss) on sale or disposal of an equity method investment.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-19000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"}]}},"EquityMethodInvestments":{"label":"Equity Method Investments","description":"This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.","units":{"USD":[{"end":"2011-12-31","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q4I"},{"end":"2011-12-31","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2012-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"}]}},"FairValueOfAssetsAcquired":{"label":"Fair Value of Assets Acquired","description":"The fair value of assets acquired in noncash investing or financing activities.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":10545000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":190000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":5006000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":10119000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":10215000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":10215000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":709000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":709000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":2389000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":2389000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":3115000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":3115000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":3376000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":3376000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":3376000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":2716000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":2716000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":2977000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":2977000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":3903000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":3903000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":4085000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":4085000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":4085000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":177000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":177000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":177000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":177000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":177000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":177000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":950000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":950000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":950000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":129000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":129000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":7922000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":7922000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":7959000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":7959000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":9311000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":9311000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":9311000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":222000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":222000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":1022000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":1022000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":2640000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":2640000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":2640000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":2640000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":250000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":250000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":1250000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":1250000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":1250000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":1250000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":2064000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":0,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":0,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":1362000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"FederalIncomeTaxExpenseBenefitContinuingOperations":{"label":"Federal Income Tax Expense (Benefit), Continuing Operations","description":"Amount of current and deferred federal income tax expense (benefit) attributable to income (loss) from continuing operations.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":-369000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-1000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-1000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":342000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":342000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":342000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-90758000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-90758000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-90758000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":10575000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":10575000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":10575000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":80582000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":80582000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":80582000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":-2357000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"FinancingReceivableAllowanceForCreditLosses":{"label":"Financing Receivable, Allowance for Credit Loss","description":"Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.","units":{"USD":[{"end":"2011-12-31","val":1501000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":1501000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":1501000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-06-30","val":988000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":988000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":988000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":988000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":988000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":988000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":988000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":988000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":988000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":988000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":688000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":688000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":688000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":688000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":688000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":351000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":0,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":0,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":0,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q4I"},{"end":"2016-03-31","val":0,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":0,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":0,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":0,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":0,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":0,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"FiniteLivedIntangibleAssetsAccumulatedAmortization":{"label":"Finite-Lived Intangible Assets, Accumulated Amortization","description":"Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.","units":{"USD":[{"end":"2010-12-31","val":23777000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":23777000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q4I"},{"end":"2011-06-30","val":27217000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":27776000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":29378000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":29378000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":29378000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":29378000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":31143000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":32360000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":34433000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":34087000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":34087000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":34087000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":34087000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":34087000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":35214000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":36104000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":37878000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":38739000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":38739000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":38739000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":38739000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":38739000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":39346000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":32313000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":32986000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":41785000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":41785000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":41785000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":41785000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":41785000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":41427000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":42738000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":42686000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":43232000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":43232000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":43232000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":43232000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":43232000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":45261000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":46258000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":47166000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":47826000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":47826000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":47826000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":47826000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":47826000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":48472000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":48858000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":49575000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":49485000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":49485000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":49485000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":49485000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":49015000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":48663000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":48948000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths":{"label":"Finite-Lived Intangible Asset, Expected Amortization, Year One","description":"Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":5800000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":4500000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":4300000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":4100000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":500000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"}]}},"FiniteLivedIntangibleAssetsAmortizationExpenseYearFive":{"label":"Finite-Lived Intangible Asset, Expected Amortization, Year Five","description":"Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":500000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"}]}},"FiniteLivedIntangibleAssetsAmortizationExpenseYearFour":{"label":"Finite-Lived Intangible Asset, Expected Amortization, Year Four","description":"Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":4500000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":600000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"}]}},"FiniteLivedIntangibleAssetsAmortizationExpenseYearThree":{"label":"Finite-Lived Intangible Asset, Expected Amortization, Year Three","description":"Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":4500000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":4400000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":500000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"}]}},"FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo":{"label":"Finite-Lived Intangible Asset, Expected Amortization, Year Two","description":"Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":4600000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":4400000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":4300000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":500000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"FiniteLivedIntangibleAssetsGross":{"label":"Finite-Lived Intangible Assets, Gross","description":"Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.","units":{"USD":[{"end":"2011-12-31","val":55292000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":54015000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":54015000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":52601000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":52601000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":50898000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":50898000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":47860000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":47860000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":48344000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":48344000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":49485000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"FiniteLivedIntangibleAssetsNet":{"label":"Finite-Lived Intangible Assets, Net","description":"Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.","units":{"USD":[{"end":"2011-12-31","val":25914000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":19928000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":19928000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":13862000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":13862000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":9113000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":9113000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":4628000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":4628000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":518000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":518000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"ForeignCurrencyTransactionGainLossBeforeTax":{"label":"Foreign Currency Transaction Gain (Loss), before Tax","description":"Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":1008000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":-108000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":-316000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":120000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":228000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":441000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":441000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":232000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":457000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":457000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":225000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":225000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":-1174000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-1174000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":-1631000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":-1631000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":-726000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":-726000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-726000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":411000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":411000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-15000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":-15000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":-426000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":-426000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":1036000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":1036000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":1051000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":1051000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":681000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":681000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":681000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-647000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":-647000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":-1818000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":-1818000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":-1171000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":-1171000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":-1104000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":-1104000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":714000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":714000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":-2222000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-2222000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-2222000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-1274000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":-1274000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":-443000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":-443000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":831000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":831000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":-1344000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":-1344000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":-901000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":-901000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":-1974000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-1974000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-1974000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-1459000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-1459000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-1421000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-1421000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":38000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":38000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":-1559000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-1559000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":-138000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-07-01","end":"2015-09-30","val":-138000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":-1650000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-1650000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-1650000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":173000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":173000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":163000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":163000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":-10000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":-10000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":143000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":143000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":-20000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":-20000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":109000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":109000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":-51000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":-51000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-85000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":-85000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":-34000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-04-01","end":"2017-06-30","val":-34000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":-88000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":-88000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":-3000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-07-01","end":"2017-09-30","val":-3000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":8000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":642000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":1112000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":470000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":874000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":-238000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"ForeignCurrencyTransactionGainLossUnrealized":{"label":"Foreign Currency Transaction Gain (Loss), Unrealized","description":"Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":441000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-726000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-726000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":411000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-15000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":1036000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":681000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":681000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":681000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-647000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":-647000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":-1818000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":-1818000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":-1104000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":-1104000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":-2222000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-2222000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-2222000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-1274000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":-1274000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":-443000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":-443000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":-1344000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":-1344000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":-1974000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-1974000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-1974000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-1459000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-1459000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-1421000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-1421000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":-1559000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-1559000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":-1650000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-1650000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-1650000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":173000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":173000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":163000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":163000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":143000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":143000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":109000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":109000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":-51000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":-51000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-85000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":-85000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":-88000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":-88000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":8000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":642000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":1112000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":874000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"ForeignIncomeTaxExpenseBenefitContinuingOperations":{"label":"Foreign Income Tax Expense (Benefit), Continuing Operations","description":"Amount of current and deferred foreign income tax expense (benefit) attributable to income (loss) from continuing operations.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":-3640000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":836000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":836000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":5375000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":5375000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":5375000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":380000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":380000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":380000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":-1494000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-1494000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-1494000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-1928000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-1928000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-1928000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":-3439000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-3439000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":1605000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"GainLossOnSaleOfPropertyPlantEquipment":{"label":"Gain (Loss) on Disposition of Property Plant Equipment","description":"Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.","units":{"USD":[{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":0,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":0,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":0,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":6000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":6000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":7000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":7000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":7000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":7000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":7000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":7000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":0,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":96000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":96000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":96000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":96000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":96000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-06-30","val":54000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":54000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"GainsLossesOnExtinguishmentOfDebt":{"label":"Gain (Loss) on Extinguishment of Debt","description":"Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-09-30","val":-7912000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-7912000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":-7912000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":-7912000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":-7912000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":-7912000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-7912000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-1504000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":-1504000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":-1504000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":-1504000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":-1504000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":-1504000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":-1504000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-1504000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-1504000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":0,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015"}]}},"Goodwill":{"label":"Goodwill","description":"Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.","units":{"USD":[{"end":"2010-12-31","val":208050000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":208050000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":208050000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2010-12-31","val":208050000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010Q4I"},{"end":"2011-06-30","val":211206000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":203768000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":205838000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":205838000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":205838000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":205838000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":205838000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2011-12-31","val":205838000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011Q4I"},{"end":"2012-03-31","val":207598000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":205636000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":209163000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":208020000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":208020000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":208020000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":208020000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":208020000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2012-12-31","val":208020000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012Q4I"},{"end":"2013-03-31","val":205974000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":202643000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":204740000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":201535000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":201535000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":201535000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":201535000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":201535000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2013-12-31","val":201535000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013Q4I"},{"end":"2014-03-31","val":197991000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":201183000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":196742000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":193722000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":193722000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":193722000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":193722000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":193722000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2014-12-31","val":193722000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014Q4I"},{"end":"2015-03-31","val":186377000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":187696000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":182196000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":179792000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":179792000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":179792000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":179792000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":179792000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2015-12-31","val":179792000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":184628000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":184403000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":183771000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":182012000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":182012000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":182012000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":182012000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":182012000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":182599000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":184368000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":187658000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":187243000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":187243000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":187243000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":187243000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":185088000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":178980000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":180253000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"GoodwillAndIntangibleAssetImpairment":{"label":"Goodwill and Intangible Asset Impairment","description":"Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"GoodwillForeignCurrencyTranslationGainLoss":{"label":"Goodwill, Foreign Currency Translation Gain (Loss)","description":"Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.","units":{"USD":[{"start":"2015-01-01","end":"2015-12-31","val":-13930000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":2220000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":2220000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":5231000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-06-30","val":-3767000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":-2494000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"GoodwillImpairmentLoss":{"label":"Goodwill, Impairment Loss","description":"Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.","units":{"USD":[{"start":"2017-01-01","end":"2017-06-30","val":0,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":0,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":0,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":0,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2018-01-01","end":"2018-06-30","val":4496000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":4496000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":4496000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":0,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"GoodwillTranslationAdjustments":{"label":"Goodwill, Translation Adjustments (Deprecated 2016-01-31)","description":"Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":-2212000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":2182000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":2182000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-6485000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-6485000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":-7813000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-7813000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-13930000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015"}]}},"IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic":{"label":"Income (Loss) from Continuing Operations before Income Taxes, Domestic","description":"The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":-53038000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":330000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":330000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":22020000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":22020000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":22020000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":22375000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":22375000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":22375000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":26957000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":26957000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":26957000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-20234000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-20234000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-20234000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":-25221000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-25221000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":-39082000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest":{"label":"Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest","description":"Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-99771000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":-46638000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":-23971000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":-63956000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":-17318000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":-67425000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":-67425000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":1110000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":-3500000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":-3500000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":-4610000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":-4610000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":-9691000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-9691000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":-6191000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":-6191000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":2608000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":2608000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":2608000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":18247000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":18247000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":19535000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":19535000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":1288000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":1288000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":22451000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":22451000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":2916000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":2916000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":43832000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":43832000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":43832000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":3122000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":3122000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":9211000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":9211000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":6089000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":6089000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":9964000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":9964000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":753000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":753000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":23741000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":23741000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":23741000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":4149000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":4149000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":9385000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":9385000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":5236000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":5236000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":17963000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":17963000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":8578000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":8578000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":19971000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":19971000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":19971000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-12934000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-12934000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-14478000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-14478000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":-1544000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":-1544000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":-19712000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-19712000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":-5234000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-07-01","end":"2015-09-30","val":-5234000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":-30085000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-30085000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-30085000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":-15309000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":-15309000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":-26793000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":-26793000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":-11484000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":-11484000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":-33625000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":-33625000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":-6832000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":-6832000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":-27820000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-27820000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":-13585000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":-13585000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-23017000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":-23017000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":-9432000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-04-01","end":"2017-06-30","val":-9432000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":-27940000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":-27940000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":-4923000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-07-01","end":"2017-09-30","val":-4923000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":-32166000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":-1949000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-12596000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":-10647000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":-17602000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":-5006000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign":{"label":"Income (Loss) from Continuing Operations before Income Taxes, Foreign","description":"The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":-14387000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":2278000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":2278000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":21812000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":21812000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":21812000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":1366000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":1366000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":1366000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":-6986000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-6986000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-6986000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-9851000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-9851000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-9851000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":-2599000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-2599000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":6916000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"IncomeLossFromEquityMethodInvestments":{"label":"Income (Loss) from Equity Method Investments","description":"Amount of income (loss) for proportionate share of equity method investee's income (loss).","units":{"USD":[{"start":"2011-01-01","end":"2011-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"}]}},"IncomeTaxExpenseBenefit":{"label":"Income Tax Expense (Benefit)","description":"Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-2974000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":-1810000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":-1385000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":-3211000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":-1401000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":-4008000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":-4008000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":599000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":1015000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":1015000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":416000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":416000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":-65000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-65000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":-1080000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":-1080000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":392000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":392000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":392000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":3541000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":3541000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":3559000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":3559000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":18000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":18000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":5346000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":5346000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":1787000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":1787000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":6782000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":6782000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":6782000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":1384000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":1384000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":1105000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":1105000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":-279000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":-279000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":1621000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":1621000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":516000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":516000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":-89940000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-89940000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-89940000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":2257000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":2257000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":4918000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":4918000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":2661000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":2661000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":9010000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":9010000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":4092000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":4092000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":10293000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":10293000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":10293000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-5288000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-5288000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-4556000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-4556000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":732000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":732000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":-5735000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-5735000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":-1179000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-07-01","end":"2015-09-30","val":-1179000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":79905000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":79905000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":79905000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":-1445000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":-1445000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":-3694000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":-3694000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":-2249000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":-2249000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":-5083000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":-5083000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":-1389000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":-1389000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":-3396000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-3396000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":-206000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":-206000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-2000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":-2000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":204000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-04-01","end":"2017-06-30","val":204000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":1419000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":1419000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":1421000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-07-01","end":"2017-09-30","val":1421000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":-685000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":-46000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-882000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":-836000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":-1168000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":-286000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"IncomeTaxExpenseBenefitContinuingOperations":{"label":"Income Tax Expense (Benefit), Continuing Operations (Deprecated 2013-01-31)","description":"The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax Income or Loss from continuing operations; income tax expense or benefit may include interest and penalties on tax uncertainties based on the entity's accounting policy.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":-4008000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":392000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":6782000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012"}]}},"IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability":{"label":"Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability","description":"Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.","units":{"USD":[{"start":"2017-01-01","end":"2017-12-31","val":38400000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"IncomeTaxesPaid":{"label":"Income Taxes Paid","description":"The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":15000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":8100000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":8100000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":3200000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":3200000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":3200000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-06-30","val":6400000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":7500000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":8000000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":8000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":8000000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-06-30","val":1900000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":1900000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":2200000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":2200000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":2300000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":2300000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":2300000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-06-30","val":300000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":300000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":300000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":300000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":300000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":300000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-09-30","val":1500000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-12-31","val":1500000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":1500000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":300000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":700000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":800000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":800000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":3500000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":4200000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":4300000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"IncomeTaxesPaidNet":{"label":"Income Taxes Paid, Net","description":"The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":281000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-09-30","val":15000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":-53000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":-53000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":15000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":7772000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":8254000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":8096000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":7979000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":7979000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":7979000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":-1462000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":1462000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":1894000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":1894000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":2608000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":2608000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":2258000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":2258000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":2258000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":3770000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":3770000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":6149000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":6149000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":7251000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":7251000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":7610000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":7610000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":7610000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":714000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":714000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":-3989000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":-3989000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":-3728000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":-3728000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":-4937000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-4937000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-4937000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":246000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":246000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":190000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":190000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":-122000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-122000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":-665000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-665000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-665000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":0,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":0,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":-187000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":-187000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":-7000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":-7000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":-3630000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-3630000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":309000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":309000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":690000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":690000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":774000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":774000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":847000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":3363000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":3681000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":3722000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"IncomeTaxReceivable":{"label":"Income Taxes Receivable","description":"Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.","units":{"CAD":[{"end":"2013-12-31","val":7900000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"}],"USD":[{"end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":7441000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":7441000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":7441000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":7441000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":7441000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":7161000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":1337000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":1274000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2014Q4I"},{"end":"2015-06-30","val":325000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"}]}},"IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance":{"label":"Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount","description":"Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":18050000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-513000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-513000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":-7666000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":-7666000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":-7666000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-100492000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-100492000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-100492000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":88737000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":88737000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":88737000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":8606000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":8606000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":13535000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"IncomeTaxReconciliationChangeInEnactedTaxRate":{"label":"Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount","description":"Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.","units":{"USD":[{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":-2366000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"IncomeTaxReconciliationForeignIncomeTaxRateDifferential":{"label":"Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount","description":"Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":949000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-245000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-245000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":-2258000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":-2258000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":-2258000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-196000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-196000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-196000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":675000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":675000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":675000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":871000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":871000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":871000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":225000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":225000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":-562000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate":{"label":"Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount","description":"The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":-23599000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":913000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":913000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":15341000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":15341000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":15341000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":8309000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":8309000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":8309000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":6990000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":6990000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":6990000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-10530000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-10530000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-10530000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":-9737000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-9737000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":-11258000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"IncomeTaxReconciliationNondeductibleExpense":{"label":"Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount","description":"Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":233000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":280000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":280000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":342000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":342000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":342000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":869000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":869000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":869000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":289000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":289000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":289000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":359000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":359000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":359000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":180000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":180000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":196000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"IncomeTaxReconciliationOtherAdjustments":{"label":"Effective Income Tax Rate Reconciliation, Other Adjustments, Amount","description":"Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":551000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":99000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":99000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":41000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":41000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":41000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":192000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":192000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":192000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":182000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":182000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":182000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-17000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-17000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-17000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":101000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":101000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":61000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"IncomeTaxReconciliationOtherReconcilingItems":{"label":"Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount","description":"Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.","units":{"USD":[{"start":"2017-01-01","end":"2017-12-31","val":2400000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"IncomeTaxReconciliationRepatriationOfForeignEarnings":{"label":"Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount","description":"Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings.","units":{"USD":[{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-09-30","val":17800000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"IncomeTaxReconciliationStateAndLocalIncomeTaxes":{"label":"Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount","description":"Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit).","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-193000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-193000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":128000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":128000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":128000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":370000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":370000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":370000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":972000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":972000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":972000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-6000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-6000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-6000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":9000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":9000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":50000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"IncomeTaxReconciliationTaxContingencies":{"label":"Effective Income Tax Rate Reconciliation, Tax Contingency, Amount","description":"Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":83000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":235000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":189000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012"}]}},"IncomeTaxReconciliationTaxContingenciesForeign":{"label":"Effective Income Tax Rate Reconciliation, Tax Contingency, Foreign, Amount","description":"Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in foreign income tax contingency.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":64000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":156000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":156000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":2000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":2000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":2000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-33000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-33000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-33000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":415000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":415000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":415000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"IncomeTaxReconciliationTaxCredits":{"label":"Effective Income Tax Rate Reconciliation, Tax Credit, Amount","description":"Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":384000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":366000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":366000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":401000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":401000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":401000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":361000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":361000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":361000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":346000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":346000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":346000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"IncreaseDecreaseInAccountsPayableAndAccruedLiabilities":{"label":"Increase (Decrease) in Accounts Payable and Accrued Liabilities","description":"The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-4751000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":-826000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":-5093000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":3393000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":3393000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":-13903000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":-7183000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":-7183000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":-16920000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-16920000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":-7684000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":-7684000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-7684000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":-7534000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":-7534000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-1829000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":-1829000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":-5832000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":-5832000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":2243000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":2243000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":2243000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-15092000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":-15092000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":-12579000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":-12579000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":-5650000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":-5650000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":-20572000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-20572000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-20572000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":7140000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":7140000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":1114000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":1114000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":6544000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":6544000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":1728000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":1728000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":1728000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":4582000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":4582000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-1723000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-1723000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":3236000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":3236000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":-1906000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-1906000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-1906000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":6333000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":6333000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":4084000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":4084000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":6748000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":6748000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":5522000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":5522000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":3067000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":3067000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-2381000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":-2381000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":4494000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":4494000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":-98000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":-633000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-5228000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":2139000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"IncreaseDecreaseInDeferredRevenue":{"label":"Increase (Decrease) in Deferred Revenue","description":"Amount of increase (decrease) in deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-27194000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":4646000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":16140000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":12811000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":12811000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":-6358000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":-3733000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":-3733000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":9545000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":9545000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":11108000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":11108000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":11108000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":985000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":985000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":2100000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":2100000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":-3207000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":-3207000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":6520000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":6520000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":6520000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-1146000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":-1146000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":-6787000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":-6787000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":-1868000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":-1868000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":-10093000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-10093000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-10093000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-9732000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":-9732000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":-15809000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":-15809000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":-14140000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":-14140000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":-6960000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-6960000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-6960000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-1843000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-1843000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-2301000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-2301000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":-14035000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-14035000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":-10539000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-10539000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-10539000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":-2098000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":-2098000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":-1160000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":-1160000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":-7244000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":-7244000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":-9378000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-9378000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":2188000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":2188000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-2888000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":-2888000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":-3532000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":-3532000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":-3353000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":11000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":2451000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":3425000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets":{"label":"Increase (Decrease) in Prepaid Expense and Other Assets","description":"Amount of increase (decrease) in prepaid expenses, and assets classified as other.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-1180000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":29000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":24000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":156000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":156000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":-188000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":-184000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":-184000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":-15000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-15000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":471000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":471000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":471000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":543000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":543000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-236000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":-236000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":-621000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":-621000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":43000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":43000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":43000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-287000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":-287000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":3744000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":3744000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":1830000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":1830000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":-586000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-586000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-586000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":785000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":785000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":21000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":21000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":703000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":703000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":405000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":405000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":405000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":273000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":273000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":750000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":750000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":-265000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-265000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":-692000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-692000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-692000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":232000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":232000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":10000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":10000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":-424000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":-424000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":-416000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-416000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":243000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":243000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":165000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":165000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":-35000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":-35000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":-175000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":389000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":1434000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":2404000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"IncreaseDecreaseInReceivables":{"label":"Increase (Decrease) in Receivables","description":"The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-22997000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":-1422000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":17794000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":7285000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":7285000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":-1482000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":1274000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":1274000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":17485000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":17485000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":20277000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":20277000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":20277000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":1092000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":1092000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-13804000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":-13804000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":-7642000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":-7642000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":8365000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":8365000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":8365000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-17520000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":-17520000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":-25637000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":-25637000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":-20200000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":-20200000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":-26915000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-26915000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-26915000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":8265000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":8265000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":-1290000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":-1290000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":-3342000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":-3342000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":12199000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":12199000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":12199000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-30856000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-30856000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-25735000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-25735000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":-33923000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-33923000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":-37490000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-37490000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-37490000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":-6734000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":-6734000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":10413000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":10413000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":-6508000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":-6508000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":8827000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":8827000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":-780000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":-780000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-6441000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":-6441000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":-12470000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":-12470000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":-1686000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":-13671000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-13517000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":-14748000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"IntangibleAssetsNetExcludingGoodwill":{"label":"Intangible Assets, Net (Excluding Goodwill)","description":"Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.","units":{"USD":[{"end":"2010-12-31","val":33117000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":33117000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":33117000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":30421000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":28107000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":26814000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":26814000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":26814000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":26814000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":26814000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":25465000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":23785000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":22543000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":20828000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":20828000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":20828000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":20828000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":20828000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":19255000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":17639000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":16322000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":14762000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":14762000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":14762000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":14762000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":14762000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":13382000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":12402000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":11174000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":10013000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":10013000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":10013000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":10013000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":10013000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":8768000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":7746000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":6598000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":5528000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":5528000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":5528000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":5528000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":5528000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":4553000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":3507000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":2462000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":1418000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":1418000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":1418000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":1418000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":1418000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":900000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":900000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":900000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":900000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":900000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":900000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":900000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":900000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":900000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":900000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"InterestExpense":{"label":"Interest Expense","description":"Amount of the cost of borrowed funds accounted for as interest expense.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":41194000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":20326000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":10177000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":30520000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":10194000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":41094000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":41094000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":10159000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":20424000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":20424000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":10265000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":10265000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":27622000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":27622000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":7198000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":7198000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":35246000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":35246000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":35246000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":7219000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":7219000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":14472000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":7253000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":21738000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":7266000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":29143000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":29143000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":29143000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":9315000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-12-31","val":28213000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":28213000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":28213000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":25222000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":25222000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":25222000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":25430000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":25430000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":25430000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":25337000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":25337000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":25164000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"InterestIncomeDepositsWithFinancialInstitutions":{"label":"Interest Income, Deposits with Financial Institutions","description":"Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.","units":{"USD":[{"start":"2014-01-01","end":"2014-12-31","val":193000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":40000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":40000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":370000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":370000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":512000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"InterestIncomeExpenseNet":{"label":"Interest Income (Expense), Net","description":"The net amount of operating interest income (expense).","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":-40536000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-34767000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-34767000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":7219000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-14472000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":-7253000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":-21738000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":-7266000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":-29011000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":-29011000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":-29011000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":9315000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":-9315000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":-15453000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":-15453000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":-6138000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":-6138000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":-21655000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":-21655000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":-6202000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":-6202000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":-27851000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-27851000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-27851000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-6207000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":-6207000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":-12418000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":-12418000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":-6211000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":-6211000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":-18724000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":-18724000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":-6306000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":-6306000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":-25029000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-25029000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-25029000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-6307000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-6307000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-12639000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-12639000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":-6332000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":-6332000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":-19020000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-19020000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":-6381000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-07-01","end":"2015-09-30","val":-6381000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":-25390000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-25390000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-25390000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":-6356000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":-6356000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":-12690000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":-12690000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":-6334000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":-6334000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":-18988000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":-18988000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":-6298000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":-6298000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":-24967000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-24967000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":-6210000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":-6210000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-12397000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":-12397000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":-6187000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-04-01","end":"2017-06-30","val":-6187000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":-18536000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":-18536000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":-6139000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-07-01","end":"2017-09-30","val":-6139000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":-24652000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":-6054000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-12086000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":-6032000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":-18070000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":-5984000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"InterestPaid":{"label":"Interest Paid, Including Capitalized Interest, Operating and Investing Activities","description":"Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":39455000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":19703000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":39381000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":39440000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":39440000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":-19679000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":19833000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":19833000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":37913000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":37913000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":37981000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":37981000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":37981000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":-13475000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":13475000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":13539000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":13539000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":27018000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":27018000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":27099000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":27099000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":27099000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":18253000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":18253000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":18331000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":18331000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":18409000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":18409000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":32008000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":32008000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":32008000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":71000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":71000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":12022000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":12022000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":12137000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":12137000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":24132000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":24132000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":24132000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":106000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":106000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":12087000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":12087000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":12230000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":12230000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":24230000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":24230000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":24230000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":116000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":116000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":12102000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":12102000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":12195000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":12195000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":24113000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":24113000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":34000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":34000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":11940000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":11940000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":11974000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":11974000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":23879000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":31000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":11946000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":11992000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"InvestmentIncomeInterest":{"label":"Investment Income, Interest","description":"Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":558000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":479000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":479000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":132000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":132000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":132000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":362000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":362000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":362000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":193000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":193000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":40000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015"}]}},"InvestmentsInAndAdvancesToAffiliatesDividendsOrInterest":{"label":"Investments in and Advances to Affiliates, Dividends or Interest","description":"Amount of dividends or interest. Give totals for each group. If operations of any controlled companies are different in character from those of the company, group such affiliates (1) within divisions and (2) by type of activities.","units":{"USD":[{"start":"2018-01-01","end":"2018-09-30","val":0,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":0,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"LeaseAndRentalExpense":{"label":"Operating Leases, Rent Expense","description":"Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":1700000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":1800000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":1800000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":1700000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":1700000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":1700000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":1300000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":1300000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":1300000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":1300000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":1300000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":1300000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":1100000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":1100000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":1100000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"Liabilities":{"label":"Liabilities","description":"Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.","units":{"USD":[{"end":"2010-12-31","val":498031000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":498031000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":498031000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":477559000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":359799000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":390490000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":390490000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":390490000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":390490000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":390490000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":391071000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":374672000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":370114000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":400386000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":400386000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":400386000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":400386000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":400386000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":361340000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":342580000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":349439000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":340557000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":340557000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":340557000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":340557000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":340557000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":331088000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":321820000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":320289000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":326667000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":326667000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":326667000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":326667000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":326667000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":324962000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":324214000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":312709000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":303575000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":299271000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":299271000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":299271000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":299271000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":300492000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":295781000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":291264000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":284112000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":284112000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":284112000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":284112000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":284112000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":293859000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":280208000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":290167000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":286934000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":286934000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":286934000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":286934000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":281717000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":279807000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":290217000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"LiabilitiesAndStockholdersEquity":{"label":"Liabilities and Equity","description":"Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.","units":{"USD":[{"end":"2010-12-31","val":491009000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":491009000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":491009000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":588224000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":454620000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":500330000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":500330000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":500330000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":500330000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":500330000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":518331000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":500205000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":502078000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":550744000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":550744000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":550744000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":550744000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":550744000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":510585000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":493390000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":503816000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":595513000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":595513000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":595513000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":595513000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":595513000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":582583000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":580971000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":577157000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":579756000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":579756000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":579756000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":579756000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":579756000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":559131000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":558116000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":534368000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":425791000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":421487000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":421487000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":421487000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":421487000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":415610000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":401410000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":390572000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":385171000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":385171000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":385171000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":385171000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":385171000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":382359000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":361649000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":370019000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":364048000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":364048000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":364048000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":364048000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":353925000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":339836000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":343582000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"LineOfCredit":{"label":"Long-term Line of Credit","description":"The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.","units":{"USD":[{"end":"2011-12-31","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":0,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":0,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":0,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":0,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":0,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":0,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":0,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":0,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"}]}},"LineOfCreditFacilityAmountOutstanding":{"label":"Line of Credit Facility, Amount Outstanding (Deprecated 2014-01-31)","description":"Amount borrowed under the credit facility as of the balance sheet date.","units":{"USD":[{"end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2014-03-31","val":0,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"}]}},"LineOfCreditFacilityCommitmentFeePercentage":{"label":"Line of Credit Facility, Commitment Fee Percentage","description":"The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.","units":{"pure":[{"start":"2012-01-01","end":"2012-12-31","val":0.005,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":0.005,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0.005,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0.005,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015"}]}},"LineOfCreditFacilityCurrentBorrowingCapacity":{"label":"Line of Credit Facility, Current Borrowing Capacity","description":"Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.","units":{"USD":[{"end":"2013-06-30","val":20000000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":30000000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2014-03-31","val":30000000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":30000000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":30000000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":30000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-03-31","val":29900000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":28300000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":17300000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":17600000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-03-31","val":12000000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"}]}},"LineOfCreditFacilityMaximumBorrowingCapacity":{"label":"Line of Credit Facility, Maximum Borrowing Capacity","description":"Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.","units":{"USD":[{"end":"2011-05-25","val":30000000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2011-05-25","val":30000000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2011Q2I"}]}},"LongTermDebt":{"label":"Long-term Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","units":{"USD":[{"end":"2011-12-31","val":275095000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q4I"},{"end":"2012-06-30","val":275063000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2015-12-31","val":245696000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":245696000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":245696000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":245696000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":245975000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":246262000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":246556000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":246857000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":246857000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":246857000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":246857000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":246857000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":247167000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":247484000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":247809000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":248142000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":248142000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":248142000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":248142000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":248484000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":248834000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":249194000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive":{"label":"Long-Term Debt, Maturity, after Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":250000000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":{"label":"Long-Term Debt, Maturity, Year One","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":29000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive":{"label":"Long-Term Debt, Maturity, Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":250000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour":{"label":"Long-Term Debt, Maturity, Year Four","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":250000000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree":{"label":"Long-Term Debt, Maturity, Year Three","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":250000000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo":{"label":"Long-Term Debt, Maturity, Year Two","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":275000000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":250000000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"MarketableSecurities":{"label":"Marketable Securities","description":"Amount of investment in marketable security.","units":{"USD":[{"end":"2010-12-31","val":3102000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2010-12-31","val":3102000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":3102000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2011-06-30","val":458000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":174000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":262000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":262000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q4I"},{"end":"2011-12-31","val":262000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":262000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2012-03-31","val":347000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"}]}},"MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments":{"label":"Marketable Securities, Gain (Loss), Excluding Other-than-temporary Impairment Loss","description":"Amount of unrealized and realized gain (loss) on investment in marketable security, excluding other-than-temporary impairment (OTTI).","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":52000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":52000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":4188000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":4188000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":1487000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":2467000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":2467000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":980000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":980000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":2467000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":2467000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":2467000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":2467000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":2467000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":230000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":230000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":230000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":230000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":230000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":230000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":230000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":230000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014"}]}},"NetCashProvidedByUsedInFinancingActivities":{"label":"Net Cash Provided by (Used in) Financing Activities","description":"Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-172000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":-163000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":-213000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":-265000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":-265000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":-54000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":116823000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":116823000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":-14593000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-14593000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":-14655000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":-14655000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-14655000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":-58000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":-58000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-123000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":-123000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":-199000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":-199000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":-278000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":-278000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":-278000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-30901000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":-30901000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":-31995000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":-31995000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":-32130000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":-32130000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":-32327000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-32327000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-32327000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-61000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":-61000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":-123000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":-123000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":-187000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":-187000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":-249000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-249000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-249000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-59000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-59000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-118000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-118000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":-168000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-168000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":-218000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-218000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-218000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":-48000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":-48000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":-100000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":-100000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":-152000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":-152000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":-205000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-205000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":-53000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":-53000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-112000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":-112000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":-178000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":-178000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":-244000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":-69000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-138000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":-2144000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"NetCashProvidedByUsedInInvestingActivities":{"label":"Net Cash Provided by (Used in) Investing Activities","description":"Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-56283000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":-17634000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":-30197000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":-45727000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":-45727000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":-44814000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":-77322000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":-77322000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":-102133000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-102133000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":-127216000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":-127216000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-127216000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":-56674000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":-56674000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-113899000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":-113899000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":-149821000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":-149821000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":-184359000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":-184359000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":-184359000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-40714000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":-40714000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":-78725000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":-78725000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":-112701000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":-112701000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":-145688000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-145688000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-145688000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-28057000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":-28057000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":-50770000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":-50770000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":-73686000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":-73686000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":-95656000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-95656000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-95656000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-23010000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-23010000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-37395000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-37395000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":-61634000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-61634000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":-77726000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-77726000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-77726000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":-6458000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":-6458000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":-13012000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":-13012000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":-20876000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":-20876000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":-26969000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-26969000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":-5887000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":-5887000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-16356000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":-16356000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":-20888000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":-20888000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":-26536000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":-9846000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-14113000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":-18355000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"NetCashProvidedByUsedInOperatingActivities":{"label":"Net Cash Provided by (Used in) Operating Activities","description":"Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":40854000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":32571000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":49642000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":109321000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":108880000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":22591000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":44086000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":44086000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":64384000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":64384000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":126097000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":126823000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":126823000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":45493000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":45082000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":98501000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":98516000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":118802000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":117766000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":171481000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":171481000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":171481000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":35412000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":35412000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":74274000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":74274000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":111166000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":111166000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":147930000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":147930000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":147930000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":30066000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":30066000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":62435000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":62435000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":99350000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":99350000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":124345000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":124345000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":124345000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":45065000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":45065000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":46030000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":46030000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":67729000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":67729000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":72636000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":72636000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":72636000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":10689000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":10689000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":4754000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":4754000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":29131000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":29131000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":30543000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":30543000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":14134000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":14134000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":20854000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":20854000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":44281000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":44281000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":40354000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":20354000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":18935000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":31511000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"NetIncomeLoss":{"label":"Net Income (Loss) Attributable to Parent","description":"The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-96797000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":-44828000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":-22586000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":-60745000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":-15917000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":-63417000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":-63417000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":511000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2011-01-01","end":"2011-03-31","val":511000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":-4515000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":-4515000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":-5026000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":-5026000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":-5026000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":-9626000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-9626000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":-5111000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":-5111000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":-5111000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":2216000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":2216000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":2216000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2011-10-01","end":"2011-12-31","val":11842000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4"},{"start":"2012-01-01","end":"2012-03-31","val":14706000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":14706000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-03-31","val":14706000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2012-01-01","end":"2012-03-31","val":14706000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":15976000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":15976000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":1270000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":1270000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-04-01","end":"2012-06-30","val":1270000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":1270000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":17105000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":17105000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":1129000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":1129000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-07-01","end":"2012-09-30","val":1129000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":1129000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":37050000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":37050000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":37050000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2012-10-01","end":"2012-12-31","val":19945000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4"},{"start":"2012-10-02","end":"2012-12-31","val":19945000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2013-01-01","end":"2013-03-31","val":1738000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":1738000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-03-31","val":1738000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2013-01-01","end":"2013-03-31","val":1738000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":8106000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":8106000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":6368000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":6368000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-04-01","end":"2013-06-30","val":6368000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":6368000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":8343000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":8343000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":237000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":237000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-07-01","end":"2013-09-30","val":237000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":237000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":113681000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":113681000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":113681000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2013-10-01","end":"2013-12-31","val":105338000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-10-01","end":"2013-12-31","val":105338000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4"},{"start":"2014-01-01","end":"2014-03-31","val":1892000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":1892000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-03-31","val":1892000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":1892000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":4467000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":4467000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":2575000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":2575000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-04-01","end":"2014-06-30","val":2575000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":2575000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":8953000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":8953000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":4486000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":4486000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-07-01","end":"2014-09-30","val":4486000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":4486000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":9678000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":9678000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":9678000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2014-10-01","end":"2014-12-31","val":725000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-10-01","end":"2014-12-31","val":725000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4"},{"start":"2015-01-01","end":"2015-03-31","val":-7646000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-7646000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-03-31","val":-7646000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2015-01-01","end":"2015-03-31","val":-7646000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-9922000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-9922000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":-2276000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":-2276000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-04-01","end":"2015-06-30","val":-2276000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":-2276000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":-13977000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-13977000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":-4055000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-07-01","end":"2015-09-30","val":-4055000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-07-01","end":"2015-09-30","val":-4055000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":-4055000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":-109990000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-109990000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-109990000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2015-10-01","end":"2015-12-31","val":-96013000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-10-01","end":"2015-12-31","val":-96013000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4"},{"start":"2016-01-01","end":"2016-03-31","val":-13864000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":-13864000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-03-31","val":-13864000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2016-01-01","end":"2016-03-31","val":-13864000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":-23099000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":-23099000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":-9235000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":-9235000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-04-01","end":"2016-06-30","val":-9235000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":-9235000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":-28542000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":-28542000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":-5443000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":-5443000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-07-01","end":"2016-09-30","val":-5443000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":-5443000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":-24424000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-24424000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2016-10-01","end":"2016-12-31","val":4118000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-10-01","end":"2016-12-31","val":4118000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4"},{"start":"2017-01-01","end":"2017-03-31","val":-13379000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":-13379000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"start":"2017-01-01","end":"2017-03-31","val":-13379000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-23015000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":-23015000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":-9636000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-04-01","end":"2017-06-30","val":-9636000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"start":"2017-04-01","end":"2017-06-30","val":-9636000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":-29359000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":-29359000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":-6344000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-07-01","end":"2017-09-30","val":-6344000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"start":"2017-07-01","end":"2017-09-30","val":-6344000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":-31481000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2017-10-01","end":"2017-12-31","val":-2122000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4"},{"start":"2018-01-01","end":"2018-03-31","val":-1903000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-11714000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":-9811000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":-16434000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":-4720000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification":{"label":"New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (Deprecated 2020-01-31)","description":"Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.","units":{"USD":[{"start":"2017-01-01","end":"2017-09-30","val":200000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-12-31","val":200000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"NoncurrentAssets":{"label":"Long-Lived Assets","description":"Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.","units":{"USD":[{"end":"2010-12-31","val":111550000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010Q4I"},{"end":"2011-12-31","val":125733000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2011-12-31","val":125733000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011Q4I"},{"end":"2012-12-31","val":184935000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":184935000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2012-12-31","val":184935000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012Q4I"},{"end":"2013-12-31","val":200389000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":200389000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2013-12-31","val":200389000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013Q4I"},{"end":"2014-12-31","val":168936000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":168936000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2014-12-31","val":168936000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014Q4I"},{"end":"2015-12-31","val":163966000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":163966000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2015-12-31","val":163966000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":117631000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":117631000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":76141000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"NotesPayable":{"label":"Notes Payable","description":"Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.","units":{"USD":[{"end":"2010-12-31","val":154000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2010-12-31","val":154000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":154000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2011-06-30","val":125000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":110000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":95000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":95000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2011-12-31","val":95000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":95000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":95000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2012-03-31","val":79000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":63000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":46000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":29000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2012-12-31","val":29000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":29000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":29000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":29000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2013-03-31","val":12000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"}]}},"NotesPayableFairValueDisclosure":{"label":"Notes Payable, Fair Value Disclosure","description":"Fair value portion of notes payable.","units":{"USD":[{"end":"2017-12-31","val":248100000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":248100000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":248100000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":248500000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":248800000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":249200000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"NotesReceivableNet":{"label":"Financing Receivable, after Allowance for Credit Loss","description":"Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.","units":{"USD":[{"end":"2010-12-31","val":84000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":84000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":84000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":3694000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":2729000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":4322000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":4322000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":4322000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":4322000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":4322000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":3985000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":4405000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":3732000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":2143000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":2143000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":2143000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":2143000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":2143000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":2101000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":2154000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":2006000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":1932000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":1932000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":1932000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":1932000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":1932000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":1832000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":1862000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":1752000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":1698000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":1698000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":1698000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":1698000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":1698000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":1545000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":1523000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":1482000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":1318000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":1318000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":1318000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":1318000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":1318000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":1694000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":4939000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":3538000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":436000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":436000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":436000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":436000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":436000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":91000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":395000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":338000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":2617000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":2617000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":2617000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":2617000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":2532000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":2583000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":2557000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"NumberOfOperatingSegments":{"label":"Number of Operating Segments","description":"Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.","units":{"Segment":[{"start":"2012-01-01","end":"2012-12-31","val":1,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":1,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":1,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":1,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":1,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":1,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"OperatingExpenses":{"label":"Operating Expenses","description":"Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":175579000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":91728000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":46519000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":145275000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":53547000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":207520000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":207520000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":49995000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":81205000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":81205000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":31210000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":31210000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":122907000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":122907000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":41702000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":41702000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":174712000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":174712000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":174712000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":47573000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":47573000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":85266000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":85266000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":37693000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":37693000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":127918000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":127918000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":42652000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":42652000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":169306000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":169306000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":169306000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":36764000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":36764000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":70910000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":70910000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":34146000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":34146000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":109095000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":109095000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":38185000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":38185000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":148044000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":148044000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":148044000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":45409000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":45409000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":82200000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":82200000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":36791000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":36791000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":107719000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":107719000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":25519000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":25519000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":151126000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":151126000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":151126000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":29494000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":29494000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":55471000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":55471000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":25977000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":25977000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":85428000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":85428000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":29957000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-07-01","end":"2015-09-30","val":29957000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":103302000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":103302000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":103302000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":21082000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":21082000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":50566000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":50566000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":29484000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":29484000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":74907000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":74907000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":24341000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":24341000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":99273000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":99273000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":27919000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":27919000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":54926000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":54926000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":27007000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-04-01","end":"2017-06-30","val":27007000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":77720000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":77720000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":22794000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-07-01","end":"2017-09-30","val":22794000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":97869000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":16035000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":33507000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":17472000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":54499000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":20992000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"OperatingIncomeLoss":{"label":"Operating Income (Loss)","description":"The net result for the period of deducting operating expenses from operating revenues.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-60234000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":-26390000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":-13557000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":-33797000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":-7407000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":-31964000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":-31964000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":9501000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2011-01-01","end":"2011-03-31","val":9501000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":13836000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":13836000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":4335000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":4335000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":4335000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":24342000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":24342000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":10506000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":10506000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":10506000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":43296000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":43296000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":43296000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2011-10-01","end":"2011-12-31","val":18954000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4"},{"start":"2012-01-01","end":"2012-03-31","val":24974000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":24974000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-03-31","val":24974000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2012-01-01","end":"2012-03-31","val":24974000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":33309000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":33309000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":8335000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":8335000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-04-01","end":"2012-06-30","val":8335000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":8335000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":42213000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":42213000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":8904000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":8904000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-07-01","end":"2012-09-30","val":8904000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":8904000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":71152000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":71152000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":71152000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2012-10-01","end":"2012-12-31","val":28939000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4"},{"start":"2012-10-02","end":"2012-12-31","val":28939000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2013-01-01","end":"2013-03-31","val":14587000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":14587000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-03-31","val":14587000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2013-01-01","end":"2013-03-31","val":14587000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":27985000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":27985000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":13398000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":13398000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-04-01","end":"2013-06-30","val":13398000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":13398000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":34210000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":34210000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":6225000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":6225000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-07-01","end":"2013-09-30","val":6225000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":6225000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":54830000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":54830000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":54830000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2013-10-01","end":"2013-12-31","val":20620000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-10-01","end":"2013-12-31","val":20620000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4"},{"start":"2014-01-01","end":"2014-03-31","val":11644000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":11644000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-03-31","val":11644000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":11644000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":22187000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":22187000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":10543000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":10543000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-04-01","end":"2014-06-30","val":10543000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":10543000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":37967000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":37967000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":15780000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":15780000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-07-01","end":"2014-09-30","val":15780000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":15780000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":46911000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":46911000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":46911000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2014-10-01","end":"2014-12-31","val":8944000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-10-01","end":"2014-12-31","val":8944000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4"},{"start":"2015-01-01","end":"2015-03-31","val":-5168000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-5168000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-03-31","val":-5168000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2015-01-01","end":"2015-03-31","val":-5168000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-423000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-423000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":4745000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":4745000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-04-01","end":"2015-06-30","val":4745000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":4745000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":862000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":862000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":1285000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-07-01","end":"2015-09-30","val":1285000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-07-01","end":"2015-09-30","val":1285000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":1285000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":-3050000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-3050000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-3050000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2015-10-01","end":"2015-12-31","val":-3912000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-10-01","end":"2015-12-31","val":-3912000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4"},{"start":"2016-01-01","end":"2016-03-31","val":-9132000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":-9132000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-03-31","val":-9132000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2016-01-01","end":"2016-03-31","val":-9132000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":-14276000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":-14276000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":-5144000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":-5144000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-04-01","end":"2016-06-30","val":-5144000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":-5144000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":-15362000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":-15362000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":-1086000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":-1086000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-07-01","end":"2016-09-30","val":-1086000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":-1086000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":-4727000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-4727000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2016-10-01","end":"2016-12-31","val":10635000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-10-01","end":"2016-12-31","val":10635000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4"},{"start":"2017-01-01","end":"2017-03-31","val":-7324000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":-7324000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"start":"2017-01-01","end":"2017-03-31","val":-7324000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-10631000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":-10631000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":-3307000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-04-01","end":"2017-06-30","val":-3307000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"start":"2017-04-01","end":"2017-06-30","val":-3307000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":-9412000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":-9412000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":1219000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-07-01","end":"2017-09-30","val":1219000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"start":"2017-07-01","end":"2017-09-30","val":1219000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":-7619000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2017-10-01","end":"2017-12-31","val":1793000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4"},{"start":"2018-01-01","end":"2018-03-31","val":3454000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-1694000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":-5148000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":-491000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":1203000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"OperatingLeasesFutureMinimumPaymentsDue":{"label":"Operating Leases, Future Minimum Payments Due","description":"Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.","units":{"USD":[{"end":"2012-12-31","val":2902000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":2082000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1390000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":1939000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":2368000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":1847000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"OperatingLeasesFutureMinimumPaymentsDueCurrent":{"label":"Operating Leases, Future Minimum Payments Due, Next Twelve Months","description":"Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":1010000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":783000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":775000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":751000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":634000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":622000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"OperatingLeasesFutureMinimumPaymentsDueInFiveYears":{"label":"Operating Leases, Future Minimum Payments, Due in Five Years","description":"Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":53000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":9000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":183000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":189000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":185000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"OperatingLeasesFutureMinimumPaymentsDueInFourYears":{"label":"Operating Leases, Future Minimum Payments, Due in Four Years","description":"Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":471000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":79000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":9000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":184000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":252000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":202000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"OperatingLeasesFutureMinimumPaymentsDueInThreeYears":{"label":"Operating Leases, Future Minimum Payments, Due in Three Years","description":"Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":672000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":505000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":80000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":184000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":560000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":265000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"OperatingLeasesFutureMinimumPaymentsDueInTwoYears":{"label":"Operating Leases, Future Minimum Payments, Due in Two Years","description":"Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":696000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":706000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":526000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":286000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":560000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":573000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"OperatingLeasesFutureMinimumPaymentsDueThereafter":{"label":"Operating Leases, Future Minimum Payments, Due Thereafter","description":"Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":351000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":173000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"OperatingLeasesRentExpenseNet":{"label":"Operating Leases, Rent Expense, Net","description":"Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":1700000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":1700000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":1800000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012"}]}},"OperatingLeasesRentExpenseSubleaseRentals1":{"label":"Operating Leases, Rent Expense, Sublease Rentals","description":"The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":325000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":299000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":284000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":300000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":282000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":300000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":100000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":100000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":100000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"}]}},"OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease":{"label":"Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (Deprecated 2012-01-31)","description":"Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity, net of tax.","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":-1818000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":-6072000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":2107000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":3925000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2011-01-01","end":"2011-03-31","val":3291000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":4434000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":1143000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":-6069000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":-10503000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3"},{"start":"2012-01-01","end":"2012-03-31","val":2556000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1"}]}},"OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent":{"label":"Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent","description":"Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":6948000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-06-30","val":4434000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":1143000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":-6069000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":-10503000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":-3037000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-3037000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":2556000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-339000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":-339000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":-2895000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":-2895000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":4762000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":4762000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":5101000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":5101000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":2969000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":2969000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":2969000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-3077000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":-3077000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":-8152000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":-8152000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":-5075000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":-5075000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":-5007000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":-5007000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":3145000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":3145000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":-9952000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-9952000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-9952000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-5531000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":-5531000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":-576000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":-576000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":4955000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":4955000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":-7458000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":-7458000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":-6882000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":-6882000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":-12081000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-12081000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-12081000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-11388000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":-11388000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":-9462000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":-9462000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":1926000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":1926000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":-17717000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":-17717000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":-8255000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-07-01","end":"2015-09-30","val":-8255000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":-21211000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-21211000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-21211000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":6744000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":6744000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":6436000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":6436000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":-308000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":-308000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":5575000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":5575000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":-861000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":-861000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":3190000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":3190000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":822000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":822000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":3391000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":3391000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":2569000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-04-01","end":"2017-06-30","val":2569000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":8143000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":8143000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":4752000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-07-01","end":"2017-09-30","val":4752000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":7526000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":-3196000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-5565000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":-2369000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":-3826000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":1739000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax":{"label":"Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax (Deprecated 2013-01-31)","description":"Net of tax amount of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":-4188000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-06-30","val":-2467000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":-980000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":-2467000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":-2467000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011"},{"start":"2012-01-01","end":"2012-06-30","val":-230000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-06-30","val":-230000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":-230000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-04-01","end":"2012-06-30","val":-230000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-09-30","val":-230000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":-230000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2"}]}},"OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax":{"label":"Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax","description":"Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":2467000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-09-30","val":230000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":230000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":230000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014"}]}},"OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax":{"label":"Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax (Deprecated 2012-01-31)","description":"Reclassification adjustment for unrealized gains or losses realized upon the sale of securities, after tax.","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":52000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":52000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-03-31","val":1487000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":2467000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":980000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":2467000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1"}]}},"OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax":{"label":"OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax","description":"Amount, after tax and before adjustment, of unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":295000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":-732000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":3124000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":2829000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":4117000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":823000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":-177000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":-177000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":-1000000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":-1000000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":-461000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-461000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":-284000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":-284000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":-373000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-373000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":85000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":85000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-32000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":-32000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":-117000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":-117000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":-32000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":-32000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":-32000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":-32000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":-32000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":0,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014"}]}},"OtherInterestAndDividendIncome":{"label":"Other Interest and Dividend Income","description":"Amount, after discount, accretion and premium amortization, of interest income and dividend income classified as other.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":498000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":558000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":479000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2011"}]}},"OtherNoncashExpense":{"label":"Other Noncash Expense","description":"Amount of expense or loss included in net income that result in no cash flow, classified as other.","units":{"USD":[{"start":"2014-01-01","end":"2014-03-31","val":14000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":14000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":14000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-03-31","val":0,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":0,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":0,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"}]}},"OtherNoncashIncome":{"label":"Other Noncash Income","description":"Amount of income or gain included in net income that result in no cash inflow (outflow), classified as other.","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":-28000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":42000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":124000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":124000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":48000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":-86000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":86000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":98000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":98000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":98000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":98000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":98000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-09-30","val":208000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":208000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":208000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":208000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":208000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-12-31","val":377000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":377000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":-15000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014"},{"start":"2016-01-01","end":"2016-12-31","val":1700000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":1800000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"}]}},"OtherNoncashIncomeExpense":{"label":"Other Noncash Income (Expense)","description":"Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other.","units":{"USD":[{"start":"2013-01-01","end":"2013-03-31","val":0,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":377000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-14000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":-14000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-09-30","val":-14000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":-15000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-15000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-09-30","val":0,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-09-30","val":572000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":572000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":1744000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":1744000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-09-30","val":0,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"OtherNonoperatingIncomeExpense":{"label":"Other Nonoperating Income (Expense)","description":"Amount of income (expense) related to nonoperating activities, classified as other.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":151000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":134000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":79000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":189000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":55000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":446000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":446000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":49000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":164000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":164000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":115000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":115000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":208000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":208000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":44000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":44000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":250000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":250000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":250000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":81000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":81000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":483000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":483000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":402000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":402000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":710000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":710000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":227000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":227000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":780000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":780000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":780000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":1000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":1000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":1000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":1000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":17000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":17000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":16000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":16000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":488000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":488000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":488000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-14000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":-14000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":59000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":59000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":73000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":73000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":64000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":64000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":5000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":5000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":63000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":63000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":63000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":0,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":0,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":5000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":5000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":5000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":5000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":5000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":5000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":0,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-07-01","end":"2015-09-30","val":0,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":5000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":5000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":5000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":6000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":6000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":10000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":10000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":4000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":4000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":582000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":582000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":572000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":572000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":1765000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":1765000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":0,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":0,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":96000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":96000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":96000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-04-01","end":"2017-06-30","val":96000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":96000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":96000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":0,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-07-01","end":"2017-09-30","val":0,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":97000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":9000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":72000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":63000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":85000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":13000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"PaymentOfFinancingAndStockIssuanceCosts":{"label":"Payment of Financing and Stock Issuance Costs","description":"The total of the cash outflow during the period which has been paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt and the cost incurred directly for the issuance of equity securities.","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":65000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":65000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":65000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":65000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-06-30","val":6067000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":6067000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":6333000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":6333000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":6338000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":6338000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":6338000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":5822000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":5822000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":6842000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":6842000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":6915000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":6915000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":7050000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":7050000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":7050000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":0,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015"}]}},"PaymentsForAdvanceToAffiliate":{"label":"Payments for Advance to Affiliate","description":"The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity).","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":11000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":5000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":9000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":9000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":9000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":1000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":6000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":6000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":752000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":752000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":755000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":755000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":755000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":4000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":4000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":9000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":9000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":11000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":11000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":13000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":13000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":13000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":246000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":246000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":251000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":251000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":253000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":253000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":256000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":256000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":256000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":3000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":3000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":7000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":7000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":10000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":10000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":13000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":13000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":13000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":3000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":3000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":8000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":8000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":10000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":10000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":13000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":13000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":13000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":11000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":11000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":16000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":16000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":19000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":19000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":21000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":21000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":3000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":3000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":8000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":8000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":11000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":11000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":14000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":2000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":7000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":554000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"PaymentsOfDividends":{"label":"Payments of Dividends","description":"Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.","units":{"USD":[{"start":"2017-01-01","end":"2017-09-30","val":0,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-01-01","end":"2018-09-30","val":1939000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"PaymentsToAcquirePropertyPlantAndEquipment":{"label":"Payments to Acquire Property, Plant, and Equipment","description":"The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":400000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":40000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":198000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":527000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":527000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":239000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":739000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":739000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":1221000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":1221000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":2121000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":2121000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":2121000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":250000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":250000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":1074000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":1074000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":1276000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":1276000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":1422000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":1422000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":1422000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":336000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":336000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":602000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":602000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":695000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":695000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":936000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":936000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":936000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":983000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":983000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":1157000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":1157000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":1404000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":1404000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":1961000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":1961000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":1961000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":107000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":107000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":150000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":150000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":406000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":406000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":432000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":432000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":432000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":75000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":75000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":145000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":145000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":176000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":176000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":304000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":304000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":136000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":136000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":250000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":250000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":362000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":362000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":534000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":100000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":173000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":208000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"PrepaidExpenseAndOtherAssets":{"label":"Prepaid Expense and Other Assets","description":"Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets.","units":{"USD":[{"end":"2010-12-31","val":10249000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":10249000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":10249000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":13486000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":12185000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":10244000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":10244000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":10244000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":10244000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":10244000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":10284000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":14369000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":9210000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":10774000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":10774000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":10774000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":10774000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":10774000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":11040000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":14536000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":12394000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":9844000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":9844000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":9844000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":9844000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":9844000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":9833000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":9665000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":9205000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":10075000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":10075000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":10075000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":10075000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":10075000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":11399000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":10129000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":7925000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":6487000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":2183000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":2183000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":2183000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":2183000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":2454000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":2167000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":2512000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":1762000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":1762000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":1762000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":1762000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":1762000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":2079000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":2497000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":2228000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":1842000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":1842000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":1842000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":1842000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":2882000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":4915000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":5134000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"ProceedsFromCollectionOfAdvanceToAffiliate":{"label":"Proceeds from Collection of Advance to Affiliate","description":"The cash inflow from the collection of money previously advanced to an entity that is related to it but not strictly controlled.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-09-30","val":50000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":50000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":50000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":50000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":50000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013"}]}},"ProceedsFromContributedCapital":{"label":"Proceeds from Contributed Capital","description":"The cash inflow associated with the amount received by a corporation from a shareholder during the period.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-05-01","end":"2011-05-31","val":125000000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2011-05-01","end":"2011-05-31","val":125000000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-06-30","val":125000000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":125000000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":125000000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":125000000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":125000000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":125000000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":125000000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013"}]}},"ProceedsFromDivestitureOfBusinessesNetOfCashDivested":{"label":"Proceeds from Divestiture of Businesses, Net of Cash Divested","description":"This element represents the cash inflow during the period from the sale of a component of the entity.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-22000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"}]}},"ProceedsFromIncomeTaxRefunds":{"label":"Proceeds from Income Tax Refunds","description":"The amount of cash received during the period as refunds for the overpayment of taxes.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":68000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":100000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":100000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":1000000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":1000000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":1000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-06-30","val":300000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":300000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":400000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":400000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":400000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-06-30","val":5900000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":5900000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":5900000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":5900000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":7200000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":7200000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":7200000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-06-30","val":100000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":400000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":400000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":1000000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":1000000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":1000000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-09-30","val":1500000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-12-31","val":5100000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":5100000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":100000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":500000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":500000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"ProceedsFromIssuanceOfSeniorLongTermDebt":{"label":"Proceeds from Issuance of Senior Long-term Debt","description":"The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":250000000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":250000000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":250000000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":250000000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":250000000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":250000000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":250000000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":250000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":250000000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":0,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015"}]}},"ProceedsFromLinesOfCredit":{"label":"Proceeds from Lines of Credit","description":"Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":401000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":10000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":10000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":10000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":10000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":737000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":737000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":737000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":737000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":737000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":737000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":737000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":737000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013"}]}},"ProceedsFromSaleAndMaturityOfMarketableSecurities":{"label":"Proceeds from Sale and Maturity of Marketable Securities","description":"The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":52000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":52000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":4188000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":1487000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":2467000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":2467000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":2467000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":2467000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":2467000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":230000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-09-30","val":230000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"}]}},"ProceedsFromSaleOfAvailableForSaleSecurities":{"label":"Proceeds from Sale of Available-for-sale Securities","description":"The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":4188000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":2467000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":2467000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-06-30","val":230000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":230000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":230000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":230000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":230000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014"}]}},"ProceedsFromSaleOfProductiveAssets":{"label":"Proceeds from Sale of Productive Assets","description":"The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":15000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":86000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":86000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":35000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":35000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":35000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":35000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":35000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":122000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":122000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":122000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":90000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":90000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":90000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":90000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":90000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":90000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":90000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-06-30","val":59000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":59000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":59000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":59000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":61000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":61000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":61000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015"}]}},"ProceedsFromSaleOfPropertyPlantAndEquipment":{"label":"Proceeds from Sale of Property, Plant, and Equipment","description":"The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.","units":{"USD":[{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":0,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":0,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":0,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":14000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":14000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":18000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":18000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":18000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":18000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":18000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":18000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":0,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":3000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":3000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":3000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":3000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":182000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-06-30","val":58000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":61000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"PropertyPlantAndEquipmentGross":{"label":"Property, Plant and Equipment, Gross","description":"Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.","units":{"USD":[{"end":"2010-12-31","val":15150000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-12-31","val":16921000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":16921000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":18279000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":18279000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":19043000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":19043000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":18828000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":18828000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":17750000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":17750000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":18187000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":18187000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":18945000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"PropertyPlantAndEquipmentNet":{"label":"Property, Plant and Equipment, Net","description":"Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.","units":{"USD":[{"end":"2010-12-31","val":5446000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":5446000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":5446000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":5150000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":4790000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":5039000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":5039000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":5039000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":5039000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":5039000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":4847000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":5245000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":5138000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":4818000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":4818000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":4818000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":4818000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":4818000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":4651000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":4364000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":4072000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":4611000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":4611000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":4611000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":4611000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":4611000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":4244000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":4037000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":3750000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":3857000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":3857000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":3857000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":3857000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":3857000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":3410000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":3131000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":2948000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":2603000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":2603000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":2603000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":2603000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":2603000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":2443000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":2198000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":1913000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":1709000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":1709000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":1709000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":1709000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":1709000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":1659000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":1622000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":1591000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":1599000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":1599000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":1599000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":1599000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":1522000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":1426000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":1332000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"ProvisionForDoubtfulAccounts":{"label":"Accounts Receivable, Credit Loss Expense (Reversal)","description":"Amount of expense (reversal of expense) for expected credit loss on accounts receivable.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":513000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-09-30","val":1524000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":1524000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010"},{"start":"2011-01-01","end":"2011-06-30","val":6000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-09-30","val":6000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-12-31","val":12000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2011"}]}},"RepaymentsOfDebtAndCapitalLeaseObligations":{"label":"Repayments of Debt and Lease Obligation","description":"Amount of cash outflow for short-term and long-term debt and lease obligation.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":124000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":71000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":108000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":146000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":146000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":40000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":81000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":81000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":122000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":122000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":164000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":164000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":164000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":42000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":42000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":91000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":91000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":150000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":150000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":212000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":212000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":212000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":62000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":62000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":124000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":124000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":186000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":186000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":248000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":248000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":248000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":61000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":61000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":123000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":123000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":187000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":187000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":249000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":249000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":249000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":59000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":59000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":118000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":118000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":168000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":168000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":218000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":218000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":218000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":48000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":48000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":100000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":100000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":152000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":152000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":205000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":205000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":53000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":53000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":112000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":112000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":178000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":178000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":244000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":69000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":138000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":205000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"RepaymentsOfLinesOfCredit":{"label":"Repayments of Lines of Credit","description":"Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":401000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":10000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":10000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":10000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":10000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":737000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":737000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":737000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":737000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":737000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":737000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":737000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":737000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013"}]}},"RepaymentsOfNotesPayable":{"label":"Repayments of Notes Payable","description":"The cash outflow for a borrowing supported by a written promise to pay an obligation.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":48000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":27000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":40000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":54000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":54000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":14000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":29000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":29000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":44000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":44000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":59000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":59000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":59000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":16000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":16000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":32000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":32000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":49000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":49000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":66000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":66000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":66000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":17000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":17000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":29000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":29000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":29000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":29000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":29000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":29000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":29000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":0,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015"}]}},"RepaymentsOfSeniorDebt":{"label":"Repayments of Senior Debt","description":"The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.","units":{"USD":[{"start":"2011-01-01","end":"2011-06-30","val":2000000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":2000000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":2000000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":2000000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":2000000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":275000000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":275000000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":275000000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":275000000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":275000000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":275000000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":275000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":275000000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":0,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":0,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-09-30","val":0,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015"}]}},"RetainedEarningsAccumulatedDeficit":{"label":"Retained Earnings (Accumulated Deficit)","description":"The cumulative amount of the reporting entity's undistributed earnings or deficit.","units":{"USD":[{"end":"2010-12-31","val":-311401000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":-311401000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":-311401000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":-315916000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":-321027000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":-309185000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":-309185000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":-309185000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":-309185000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":-309185000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":-294479000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":-293209000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":-292080000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":-272135000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":-272135000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":-272135000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":-272135000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":-272135000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":-270397000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":-264029000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":-263792000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":-158454000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":-158454000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":-158454000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":-158454000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":-158454000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":-156562000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":-153987000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":-149501000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":-148776000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":-148776000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":-148776000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":-148776000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":-148776000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":-156422000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":-158698000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":-162753000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":-258766000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":-258766000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":-258766000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":-258766000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":-258766000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":-272630000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":-281865000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":-287308000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":-283190000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":-283190000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":-283190000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":-283190000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":-283190000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":-296569000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":-306205000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":-312549000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":-314671000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":-314671000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":-314671000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":-314671000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":-316383000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":-326194000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":-334598000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"RevenueFromContractWithCustomerExcludingAssessedTax":{"label":"Revenue from Contract with Customer, Excluding Assessed Tax","description":"Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.","units":{"USD":[{"start":"2017-01-01","end":"2017-03-31","val":20595000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":44295000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":23700000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":68308000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":24013000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2018-01-01","end":"2018-03-31","val":19489000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":31813000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":12324000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":54008000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":22195000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"RevenueRemainingPerformanceObligation":{"label":"Revenue, Remaining Performance Obligation, Amount","description":"Amount of transaction price allocated to performance obligation that has not been recognized as revenue.","units":{"USD":[{"end":"2018-03-31","val":7500000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-09-30","val":6300000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"Revenues":{"label":"Revenues","description":"Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":115345000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":65338000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":32962000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":111478000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":46140000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":175556000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":175556000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":59496000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2011-01-01","end":"2011-03-31","val":59496000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":95041000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":95041000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":35545000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":35545000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":35545000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":147249000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":147249000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":52208000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":52208000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":52208000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":218008000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":218008000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":218008000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2011-10-01","end":"2011-12-31","val":70759000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4"},{"start":"2012-01-01","end":"2012-03-31","val":72547000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":72547000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-03-31","val":72547000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2012-01-01","end":"2012-03-31","val":72547000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":118575000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":118575000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":46028000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":46028000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-04-01","end":"2012-06-30","val":46028000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":46028000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":170131000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":170131000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":51556000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":51556000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-07-01","end":"2012-09-30","val":51556000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":51556000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":240458000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":240458000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":240458000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2012-10-01","end":"2012-12-31","val":70327000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4"},{"start":"2012-10-02","end":"2012-12-31","val":70327000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2013-01-01","end":"2013-03-31","val":51351000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":51351000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-03-31","val":51351000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2013-01-01","end":"2013-03-31","val":51351000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":98895000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":98895000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":47544000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":47544000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-04-01","end":"2013-06-30","val":47544000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":47544000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":143305000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":143305000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":44410000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":44410000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-07-01","end":"2013-09-30","val":44410000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":44410000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":202874000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":202874000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":202874000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2013-10-01","end":"2013-12-31","val":59569000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-10-01","end":"2013-12-31","val":59569000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4"},{"start":"2014-01-01","end":"2014-03-31","val":57053000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":57053000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-03-31","val":57053000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":57053000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":104387000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":104387000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":47334000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":47334000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-04-01","end":"2014-06-30","val":47334000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":47334000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":145686000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":145686000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":41299000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":41299000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-07-01","end":"2014-09-30","val":41299000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":41299000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":198037000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":198037000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":198037000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2014-10-01","end":"2014-12-31","val":52351000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-10-01","end":"2014-12-31","val":52351000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4"},{"start":"2015-01-01","end":"2015-03-31","val":24326000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":24326000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-03-31","val":24326000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2015-01-01","end":"2015-03-31","val":24326000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":55048000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":55048000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":30722000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":30722000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-04-01","end":"2015-06-30","val":30722000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":30722000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":86290000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":86290000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":31242000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-07-01","end":"2015-09-30","val":31242000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-07-01","end":"2015-09-30","val":31242000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":31242000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":100252000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":100252000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":100252000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2015-10-01","end":"2015-12-31","val":13962000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-10-01","end":"2015-12-31","val":13962000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4"},{"start":"2016-01-01","end":"2016-03-31","val":11950000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":11950000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-03-31","val":11950000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2016-01-01","end":"2016-03-31","val":11950000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":36290000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":36290000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":24340000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":24340000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-04-01","end":"2016-06-30","val":24340000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":24340000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":59545000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":59545000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":23255000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":23255000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-07-01","end":"2016-09-30","val":23255000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":23255000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":94546000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":94546000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2016-10-01","end":"2016-12-31","val":35001000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-10-01","end":"2016-12-31","val":35001000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4"},{"start":"2017-01-01","end":"2017-03-31","val":20595000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":20595000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"start":"2017-01-01","end":"2017-03-31","val":20595000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":44295000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":44295000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":23700000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-04-01","end":"2017-06-30","val":23700000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"start":"2017-04-01","end":"2017-06-30","val":23700000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":68308000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":68308000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":24013000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-07-01","end":"2017-09-30","val":24013000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"start":"2017-07-01","end":"2017-09-30","val":24013000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":90250000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2017-10-01","end":"2017-12-31","val":21942000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4"},{"start":"2018-01-01","end":"2018-03-31","val":19489000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":31813000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":12324000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":54008000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":22195000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"SaleOfStockPercentageOfOwnershipAfterTransaction":{"label":"Sale of Stock, Percentage of Ownership after Transaction","description":"Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.","units":{"pure":[{"start":"2018-01-01","end":"2018-06-30","val":0.997,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"}]}},"SellingGeneralAndAdministrativeExpense":{"label":"Selling, General and Administrative Expense","description":"The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":25090000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":14898000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":8382000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":23414000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":8516000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":31831000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":31831000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":7565000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":15490000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":15490000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-04-01","end":"2011-06-30","val":7925000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":7925000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":23127000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":23127000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":7637000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":7637000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":31649000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":31649000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":31649000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":8092000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":8092000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":15797000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":15797000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-04-01","end":"2012-06-30","val":7705000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":7705000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":20642000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":20642000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":4845000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":4845000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":29088000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":29088000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":29088000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":7387000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":7387000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":13641000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":13641000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":6254000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-04-01","end":"2013-06-30","val":6254000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2013Q2"},{"start":"2013-01-01","end":"2013-09-30","val":19553000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":19553000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-07-01","end":"2013-09-30","val":5912000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":5912000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":25971000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":25971000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":25971000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":7425000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":7425000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":14318000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":14318000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-04-01","end":"2014-06-30","val":6893000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":6893000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":21499000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":21499000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":7181000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-07-01","end":"2014-09-30","val":7181000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":29799000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":29799000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":29799000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":6314000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":6314000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":11857000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":11857000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":5543000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-04-01","end":"2015-06-30","val":5543000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":17150000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":17150000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":5293000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-07-01","end":"2015-09-30","val":5293000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":22184000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":22184000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":22184000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":5959000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":5959000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":10627000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":10627000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-04-01","end":"2016-06-30","val":4668000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":4668000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":16013000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":16013000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-07-01","end":"2016-09-30","val":5386000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":5386000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":24119000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":24119000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":5646000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":5646000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":10651000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":10651000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-04-01","end":"2017-06-30","val":5005000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-04-01","end":"2017-06-30","val":5005000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":15700000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":15700000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-07-01","end":"2017-09-30","val":5049000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-07-01","end":"2017-09-30","val":5049000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q3"},{"start":"2017-01-01","end":"2017-12-31","val":20291000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":5707000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":10514000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-04-01","end":"2018-06-30","val":4807000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2"},{"start":"2018-01-01","end":"2018-09-30","val":21369000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2018-07-01","end":"2018-09-30","val":10855000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3"}]}},"SeniorNotes":{"label":"Senior Notes","description":"Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.","units":{"USD":[{"end":"2010-12-31","val":402056000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":402056000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":402056000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":400000000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":275000000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":275000000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":275000000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":275000000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":275000000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":275000000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":275000000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":275000000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":275000000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":275000000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":275000000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":275000000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":275000000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":275000000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":250000000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":250000000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":250000000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":250000000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":250000000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":250000000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":250000000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":250000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":250000000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":250000000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":250000000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":250000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":250000000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":250000000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":250000000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":250000000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":250000000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":250000000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":250000000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":250000000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":250000000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":250000000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":250000000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":250000000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":250000000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":250000000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":250000000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":250000000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":250000000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":250000000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":250000000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":250000000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":250000000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":250000000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":250000000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":250000000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":250000000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":250000000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":250000000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":250000000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":250000000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":250000000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate","description":"The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.","units":{"pure":[{"start":"2010-01-01","end":"2010-04-30","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2010-05-01","end":"2010-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate","description":"The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.","units":{"pure":[{"start":"2010-01-01","end":"2010-04-30","val":0.45,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-12-31","val":0.45,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2010-05-01","end":"2010-12-31","val":0.45,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":0.45,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":0.45,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0.45,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":0.45,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0.45,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":0.45,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0.45,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":0.45,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0.45,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0.45,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":0.45,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate","description":"The risk-free interest rate assumption that is used in valuing an option on its own shares.","units":{"pure":[{"start":"2010-01-01","end":"2010-04-30","val":0.0301,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-12-31","val":0.0323,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2010-05-01","end":"2010-12-31","val":0.026,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":0.0236,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":0.0236,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0.017,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":0.017,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0.017,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":0.0095,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0.0095,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":0.0095,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0.0198,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0.0198,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":0.0198,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant","description":"The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.","units":{"shares":[{"end":"2010-12-31","val":13000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010Q4I"},{"end":"2011-12-31","val":12000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2011-12-31","val":12000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011Q4I"},{"end":"2012-12-31","val":15000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":15000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2012-12-31","val":15000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012Q4I"},{"end":"2013-12-31","val":11000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":11000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2013-12-31","val":11000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013Q4I"},{"end":"2014-12-31","val":10000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":10000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2014-12-31","val":10000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014Q4I"},{"end":"2015-12-31","val":10000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":10000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2015-12-31","val":10000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":26000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":26000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":16000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number","description":"The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.","units":{"shares":[{"end":"2010-12-31","val":62000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010Q4I"},{"end":"2011-12-31","val":76000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2011-12-31","val":76000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011Q4I"},{"end":"2012-12-31","val":80000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":80000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2012-12-31","val":80000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012Q4I"},{"end":"2013-12-31","val":82000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":82000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2013-12-31","val":82000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013Q4I"},{"end":"2014-12-31","val":88000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":88000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2014-12-31","val":88000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014Q4I"},{"end":"2015-12-31","val":93000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":93000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2015-12-31","val":93000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":85000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":85000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":22000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price","description":"The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.","units":{"USD/shares":[{"end":"2010-12-31","val":193.13,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010Q4I"},{"end":"2011-12-31","val":193.13,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2011-12-31","val":193.13,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011Q4I"},{"end":"2012-12-31","val":193.29,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":193.29,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2012-12-31","val":193.29,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012Q4I"},{"end":"2013-12-31","val":192.96,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":196.33,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2013-12-31","val":196.33,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013Q4I"},{"end":"2014-12-31","val":199.5,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":199.5,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2014-12-31","val":199.5,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014Q4I"},{"end":"2015-12-31","val":202.48,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":202.48,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2015-12-31","val":202.48,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":203.48,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":203.48,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":228.81,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value","description":"Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.","units":{"USD":[{"start":"2013-01-01","end":"2013-12-31","val":200000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":200000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period","description":"Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.","units":{"shares":[{"start":"2010-01-01","end":"2010-12-31","val":91000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":62000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period","description":"The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.","units":{"shares":[{"start":"2010-01-01","end":"2010-12-31","val":1000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":1000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":1000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":1000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":16000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":16000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":8000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross","description":"Gross number of share options (or share units) granted during the period.","units":{"shares":[{"start":"2010-01-01","end":"2010-12-31","val":91000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":1000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":1000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":45000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":45000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":45000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":4000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":4000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":4000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":1000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":1000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":1000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value","description":"The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.","units":{"USD/shares":[{"start":"2010-01-01","end":"2010-04-30","val":21.43,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-12-31","val":47.15,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2010-05-01","end":"2010-12-31","val":36.74,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":123.29,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":123.29,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":95.25,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":95.25,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":95.25,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":113.31,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":113.31,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":113.31,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":106.08,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":106.08,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":106.08,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number","description":"Number of options outstanding, including both vested and non-vested options.","units":{"shares":[{"end":"2009-12-31","val":92000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2009Q4I"},{"end":"2010-12-31","val":91000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2010-12-31","val":91000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2010Q4I"},{"end":"2011-12-31","val":84000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2011-12-31","val":84000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2011-12-31","val":84000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2011Q4I"},{"end":"2012-12-31","val":129000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":129000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2012-12-31","val":129000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2012-12-31","val":129000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2012Q4I"},{"end":"2013-12-31","val":129000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":129000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2013-12-31","val":129000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2013-12-31","val":129000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2013Q4I"},{"end":"2014-12-31","val":130000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":130000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2014-12-31","val":130000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2014-12-31","val":130000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2014Q4I"},{"end":"2015-12-31","val":130000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":130000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2015-12-31","val":130000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":114000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":114000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":44000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price","description":"Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.","units":{"USD/shares":[{"end":"2009-12-31","val":392.07,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2009Q4I"},{"end":"2010-12-31","val":193.13,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2010-12-31","val":193.13,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2010Q4I"},{"end":"2011-12-31","val":193.91,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2011-12-31","val":193.91,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2011-12-31","val":193.91,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2011Q4I"},{"end":"2012-12-31","val":216.62,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":216.62,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2012-12-31","val":216.62,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2012-12-31","val":216.62,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2012Q4I"},{"end":"2013-12-31","val":218.38,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":218.38,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2013-12-31","val":218.38,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2013-12-31","val":218.38,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2013Q4I"},{"end":"2014-12-31","val":218.46,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":218.46,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2014-12-31","val":218.46,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2014-12-31","val":218.46,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2014Q4I"},{"end":"2015-12-31","val":218.46,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":218.46,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2015-12-31","val":218.46,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":217.24,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":217.24,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":243.26,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value","description":"Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.","units":{"USD":[{"end":"2014-12-31","val":1900000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value","description":"Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.","units":{"USD":[{"end":"2014-12-31","val":1900000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice":{"label":"Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price","description":"Weighted average price at which option holders acquired shares when converting their stock options into shares.","units":{"USD/shares":[{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":193.13,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":193.13,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":193.13,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":193.13,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":193.13,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015"}]}},"ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice":{"label":"Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price","description":"Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.","units":{"USD/shares":[{"start":"2010-01-01","end":"2010-12-31","val":392.09,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":193.13,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice":{"label":"Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price","description":"Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.","units":{"USD/shares":[{"start":"2010-01-01","end":"2010-12-31","val":389.42,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":258.37,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":258.37,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":258.37,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":227.19,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":227.19,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":200.95,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice":{"label":"Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price","description":"Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.","units":{"USD/shares":[{"start":"2010-01-01","end":"2010-12-31","val":193.13,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":258.37,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":258.37,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":258.37,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":258.37,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":258.37,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":258.37,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":258.37,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":258.37,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":229.84,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":229.84,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":229.84,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016"}]}},"SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value","description":"Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.","units":{"USD":[{"start":"2012-01-01","end":"2012-12-31","val":600000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":500000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":500000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":600000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":600000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":600000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":600000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":600000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":600000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":600000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":600000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":300000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"StateAndLocalIncomeTaxExpenseBenefitContinuingOperations":{"label":"State and Local Income Tax Expense (Benefit), Continuing Operations","description":"Amount of state and local current and deferred income tax expense (benefit) attributable to continuing operations.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":1000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-443000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-443000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":1065000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":1065000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":1065000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":438000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":438000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":438000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":1212000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":1212000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":1212000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":1251000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":1251000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":1251000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":43000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":43000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":67000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"StockholdersEquity":{"label":"Stockholders' Equity Attributable to Parent","description":"Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.","units":{"USD":[{"end":"2010-12-31","val":-7022000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"end":"2010-12-31","val":-7022000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":-7022000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010Q4I"},{"end":"2011-06-30","val":110665000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2011Q2I"},{"end":"2011-09-30","val":94821000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":109840000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2011-12-31","val":109840000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"end":"2011-12-31","val":109840000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"end":"2011-12-31","val":109840000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":109840000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":127260000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2012Q1I"},{"end":"2012-06-30","val":125533000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13","frame":"CY2012Q2I"},{"end":"2012-09-30","val":131964000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":150358000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":150358000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":150358000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":150358000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":150358000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-03-31","val":149245000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":150810000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":154377000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":254956000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":254956000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"end":"2013-12-31","val":254956000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":254956000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":254956000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-03-31","val":251495000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"},{"end":"2014-06-30","val":259151000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":256868000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":253089000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":253089000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":253089000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"end":"2014-12-31","val":253089000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"end":"2014-12-31","val":253089000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":234169000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":233902000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":221659000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":122216000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":122216000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"end":"2015-12-31","val":122216000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"end":"2015-12-31","val":122216000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":122216000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":115118000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2016Q1I"},{"end":"2016-06-30","val":105629000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":99308000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":101059000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":101059000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"end":"2016-12-31","val":101059000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":101059000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":101059000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":88500000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2017Q1I"},{"end":"2017-06-30","val":81441000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":79852000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":77114000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16"},{"end":"2017-12-31","val":77114000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":77114000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":77114000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2017Q4I"},{"end":"2018-03-31","val":72208000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":60029000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":53365000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08","frame":"CY2018Q3I"}]}},"StockIssuedDuringPeriodSharesStockOptionsExercised":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period","description":"Number of share options (or share units) exercised during the current period.","units":{"shares":[{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":8000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":8000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":3000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":3000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":3000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015"}]}},"StockOptionPlanExpense":{"label":"Stock or Unit Option Plan Expense","description":"Amount of noncash expense for option under share-based payment arrangement.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":3034000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":2299000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-01-01","end":"2010-09-30","val":2729000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-01-01","end":"2010-12-31","val":3157000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2010-01-01","end":"2010-12-31","val":3157000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":264000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":346000,"accn":"0001193125-11-221441","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":346000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2011-01-01","end":"2011-09-30","val":400000,"accn":"0001193125-11-306425","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":400000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-12-31","val":453000,"accn":"0001193125-12-114463","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"start":"2011-01-01","end":"2011-12-31","val":453000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":453000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":73000,"accn":"0000750813-12-000006","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":73000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":318000,"accn":"0000750813-12-000018","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-13"},{"start":"2012-01-01","end":"2012-06-30","val":318000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":519000,"accn":"0000750813-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-09-30","val":519000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":761000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":761000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":761000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":226000,"accn":"0000750813-13-000024","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"start":"2013-01-01","end":"2013-03-31","val":226000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":498000,"accn":"0000750813-13-000031","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":498000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":683000,"accn":"0000750813-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-30","val":683000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":869000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":869000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":869000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":178000,"accn":"0000750813-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13"},{"start":"2014-01-01","end":"2014-03-31","val":178000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":304000,"accn":"0000750813-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":304000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2014-01-01","end":"2014-09-30","val":417000,"accn":"0000750813-14-000040","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":417000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2014-01-01","end":"2014-12-31","val":536000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":536000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":536000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":114000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"start":"2015-01-01","end":"2015-03-31","val":114000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":197000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11"},{"start":"2015-01-01","end":"2015-06-30","val":197000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":264000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12"},{"start":"2015-01-01","end":"2015-09-30","val":264000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-01-01","end":"2015-12-31","val":328000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":328000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":328000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":22000,"accn":"0000750813-16-000049","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-12"},{"start":"2016-01-01","end":"2016-03-31","val":22000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":76000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-01-01","end":"2016-06-30","val":76000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2016-01-01","end":"2016-09-30","val":59000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":59000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2016-01-01","end":"2016-12-31","val":77000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":77000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":-2000,"accn":"0000750813-17-000019","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-11"},{"start":"2017-01-01","end":"2017-03-31","val":-2000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":6000,"accn":"0000750813-17-000028","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"start":"2017-01-01","end":"2017-06-30","val":6000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":9000,"accn":"0000750813-17-000037","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"start":"2017-01-01","end":"2017-09-30","val":9000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"},{"start":"2017-01-01","end":"2017-12-31","val":10000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":2000,"accn":"0000750813-18-000014","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":3000,"accn":"0000750813-18-000030","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":4000,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions":{"label":"Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions","description":"Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.","units":{"pure":[{"start":"2018-01-01","end":"2018-09-30","val":0.998,"accn":"0000750813-18-000038","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-08"}]}},"TaxCreditCarryforwardValuationAllowance":{"label":"Tax Credit Carryforward, Valuation Allowance","description":"Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized.","units":{"USD":[{"end":"2017-12-22","val":2500000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"UnamortizedDebtIssuanceExpense":{"label":"Unamortized Debt Issuance Expense","description":"The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.","units":{"USD":[{"end":"2011-12-31","val":4400000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":2400000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":2400000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":6700000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":6700000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":5600000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":5600000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-03-31","val":5100000,"accn":"0000750813-15-000017","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":4800000,"accn":"0000750813-15-000024","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-11","frame":"CY2015Q2I"},{"end":"2015-09-30","val":4600000,"accn":"0000750813-15-000031","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-12","frame":"CY2015Q3I"},{"end":"2015-12-31","val":4400000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"}]}},"UndistributedEarningsOfForeignSubsidiaries":{"label":"Undistributed Earnings of Foreign Subsidiaries","description":"Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.","units":{"USD":[{"end":"2013-12-31","val":0,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-12-31","val":300000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"}]}},"UnrecognizedTaxBenefits":{"label":"Unrecognized Tax Benefits","description":"Amount of unrecognized tax benefits.","units":{"USD":[{"end":"2009-12-31","val":5545000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2009Q4I"},{"end":"2010-12-31","val":6151000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2010-12-31","val":6151000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2010Q4I"},{"end":"2011-12-31","val":6016000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2011-12-31","val":6016000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2011-12-31","val":6016000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2011Q4I"},{"end":"2012-12-31","val":6150000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":6150000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2012-12-31","val":6150000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2012-12-31","val":6150000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2012Q4I"},{"end":"2013-12-31","val":5752000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":5752000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2013-12-31","val":5752000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2013-12-31","val":5752000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2013Q4I"},{"end":"2014-12-31","val":5274000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":5274000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2014-12-31","val":5274000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2014-12-31","val":5274000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2014Q4I"},{"end":"2015-12-31","val":4618000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":4618000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2015-12-31","val":4618000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":493000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":493000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":279000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities":{"label":"Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities","description":"Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.","units":{"USD":[{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-09-30","val":2400000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":300000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":1783000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":1783000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued":{"label":"Unrecognized Tax Benefits, Income Tax Penalties Accrued","description":"Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return.","units":{"USD":[{"end":"2011-12-31","val":1000000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":1000000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":1000000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":1000000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":1000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":900000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":900000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":700000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":700000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense":{"label":"Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense","description":"Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":-200000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":235000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":200000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":189000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":200000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2013-01-01","end":"2013-12-31","val":199000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013"}]}},"UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions":{"label":"Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions","description":"Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":310000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":197000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015"}]}},"UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued":{"label":"Unrecognized Tax Benefits, Interest on Income Taxes Accrued","description":"Amount of interest expense accrued for an underpayment of income taxes.","units":{"USD":[{"end":"2011-12-31","val":500000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":700000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":700000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012Q4I"},{"end":"2013-12-31","val":900000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":900000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1000000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":1000000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":1300000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":1300000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":400000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":400000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":100000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense":{"label":"Unrecognized Tax Benefits, Interest on Income Taxes Expense","description":"Amount of interest expense for an underpayment of income taxes.","units":{"USD":[{"start":"2012-01-01","end":"2012-12-31","val":189000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":199000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":199000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":186000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":200000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":200000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":500000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":500000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":500000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-09-30","val":100000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-12-31","val":-100000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-100000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":-100000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"UnrecognizedTaxBenefitsPeriodIncreaseDecrease":{"label":"Unrecognized Tax Benefits, Period Increase (Decrease)","description":"Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.","units":{"USD":[{"start":"2013-01-01","end":"2013-12-31","val":199000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":186000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":186000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":422000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":422000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":422000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-06-30","val":-2001000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":-2065000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":-2865000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":-864000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":-2780000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-2780000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":-341000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations":{"label":"Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations","description":"Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.","units":{"USD":[{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-09-30","val":600000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":600000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":449000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":449000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":250000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate":{"label":"Unrecognized Tax Benefits that Would Impact Effective Tax Rate","description":"The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.","units":{"USD":[{"end":"2012-12-31","val":6200000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":5800000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2013Q4I"},{"end":"2014-12-31","val":5300000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2014Q4I"},{"end":"2015-12-31","val":4400000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2015Q4I"},{"end":"2016-06-30","val":500000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2I"},{"end":"2016-09-30","val":200000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":500000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":300000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"ValuationAllowanceDeferredTaxAssetChangeInAmount":{"label":"Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount","description":"Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":576000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":-7574000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":7574000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":100492000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":100492000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-88737000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":88737000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-06-30","val":7250000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2016-04-01","end":"2016-06-30","val":4035000,"accn":"0000750813-16-000062","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":8942000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-07-01","end":"2016-09-30","val":1692000,"accn":"0000750813-16-000073","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3"},{"start":"2016-01-01","end":"2016-12-31","val":6675000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-6675000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":34349000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"ValuationAllowancesAndReservesBalance":{"label":"SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount","description":"Amount of valuation and qualifying accounts and reserves.","units":{"USD":[{"end":"2009-12-31","val":89802000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2009Q4I"},{"end":"2010-12-31","val":110046000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2010-12-31","val":110046000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2010Q4I"},{"end":"2011-12-31","val":110610000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2011-12-31","val":110610000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2011-12-31","val":110610000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2011Q4I"},{"end":"2012-12-31","val":102217000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":102217000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2012-12-31","val":102217000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2012-12-31","val":102217000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2012Q4I"},{"end":"2013-12-31","val":1020000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"end":"2013-12-31","val":1020000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2013-12-31","val":1020000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2013-12-31","val":1020000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2013Q4I"},{"end":"2014-12-31","val":268000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":268000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2014-12-31","val":268000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2014-12-31","val":268000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2014Q4I"},{"end":"2015-12-31","val":89004000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":89004000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2015-12-31","val":89004000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":95635000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":95635000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":61239000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"ValuationAllowancesAndReservesChargedToCostAndExpense":{"label":"SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense","description":"Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":20320000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":588000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":588000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":-8035000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":-8035000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":-8035000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-100792000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":-100792000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-100792000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":-337000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":-337000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-337000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":88741000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":88741000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":88741000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":8621000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":8621000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":-27808000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"ValuationAllowancesAndReservesDeductions":{"label":"SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction","description":"Amount of decrease in valuation and qualifying accounts and reserves.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":76000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":24000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":24000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":358000,"accn":"0000750813-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":358000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":358000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":405000,"accn":"0000750813-14-000009","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-21"},{"start":"2013-01-01","end":"2013-12-31","val":405000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":405000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":415000,"accn":"0000750813-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":415000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":415000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":5000,"accn":"0000750813-16-000034","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":5000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":5000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":1990000,"accn":"0000750813-17-000011","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":1990000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":6588000,"accn":"0000750813-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}}}}}