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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":"2009-12-31","val":151445000,"accn":"0001193125-11-047299","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25","frame":"CY2009Q4I"},{"end":"2009-12-31","val":151445000,"accn":"0001193125-10-236124","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-26"},{"end":"2009-12-31","val":151445000,"accn":"0001193125-10-166683","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-07-27"},{"end":"2010-06-30","val":144063000,"accn":"0001193125-10-166683","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-07-27","frame":"CY2010Q2I"},{"end":"2010-09-30","val":127232000,"accn":"0001193125-10-236124","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-26","frame":"CY2010Q3I"},{"end":"2010-12-31","val":115075000,"accn":"0001193125-12-075664","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23","frame":"CY2010Q4I"},{"end":"2010-12-31","val":115075000,"accn":"0001193125-11-279434","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-25"},{"end":"2010-12-31","val":115075000,"accn":"0001193125-11-196756","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-26"},{"end":"2010-12-31","val":115075000,"accn":"0001193125-11-108568","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-04-26"},{"end":"2010-12-31","val":115075000,"accn":"0001193125-11-047299","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25"},{"end":"2011-03-31","val":90020000,"accn":"0001193125-11-108568","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-04-26","frame":"CY2011Q1I"},{"end":"2011-06-30","val":65592000,"accn":"0001193125-11-196756","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-26","frame":"CY2011Q2I"},{"end":"2011-09-30","val":41746000,"accn":"0001193125-11-279434","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-25","frame":"CY2011Q3I"},{"end":"2011-12-31","val":103900000,"accn":"0001193125-12-075664","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23","frame":"CY2011Q4I"}]}},"AdjustmentsToAdditionalPaidInCapitalReallocationOfMinorityInterest":{"label":"Adjustments to Additional Paid in Capital, Reallocation of Noncontrolling Interest (Deprecated 2013-01-31)","description":"Change in additional paid in capital as a result of a reallocation of a subsidiary's stockholders' equity to noncontrolling interest due to the subsidiary issuing stock. This reallocation is from a capital transaction.","units":{"USD":[{"start":"2008-01-01","end":"2008-12-31","val":0,"accn":"0001193125-11-047299","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25","frame":"CY2008"},{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0001193125-11-047299","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":-1346000,"accn":"0001193125-12-075664","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2010-01-01","end":"2010-12-31","val":-1346000,"accn":"0001193125-11-047299","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25"},{"start":"2010-01-01","end":"2010-12-31","val":-1346000,"accn":"0001104349-13-000012","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-21","frame":"CY2010"}]}},"AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue":{"label":"APIC, Share-based Payment Arrangement, Increase for Cost Recognition","description":"Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":3652000,"accn":"0001193125-12-075664","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":3698000,"accn":"0001193125-12-075664","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2010-01-01","end":"2010-12-31","val":3698000,"accn":"0001104349-13-000012","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-21","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":4883000,"accn":"0001193125-12-075664","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2011-01-01","end":"2011-12-31","val":4883000,"accn":"0001104349-13-000012","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-21"},{"start":"2011-01-01","end":"2011-12-31","val":4883000,"accn":"0001104349-14-000011","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-20","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":4880000,"accn":"0001104349-13-000012","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-21"},{"start":"2012-01-01","end":"2012-12-31","val":4880000,"accn":"0001104349-14-000011","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-20"},{"start":"2012-01-01","end":"2012-12-31","val":4880000,"accn":"0001104349-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":5330000,"accn":"0001104349-14-000011","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":5330000,"accn":"0001104349-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19"},{"start":"2013-01-01","end":"2013-12-31","val":5330000,"accn":"0001104349-16-000042","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-18","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":5129000,"accn":"0001104349-15-000009","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":5129000,"accn":"0001104349-16-000042","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-18"},{"start":"2014-01-01","end":"2014-12-31","val":5129000,"accn":"0001104349-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":6594000,"accn":"0001104349-16-000042","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-18"},{"start":"2015-01-01","end":"2015-12-31","val":6594000,"accn":"0001104349-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"start":"2015-01-01","end":"2015-12-31","val":6594000,"accn":"0001104349-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":6422000,"accn":"0001104349-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"start":"2016-01-01","end":"2016-12-31","val":6422000,"accn":"0001104349-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":6524000,"accn":"0001104349-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01","frame":"CY2017"}]}},"AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation":{"label":"Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation","description":"Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). 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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash 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Includes other kinds of accounts that have the general characteristics of demand deposits. 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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 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