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The table may be detailed by subsidiary (legal entity) and include information by type of debt or equity detailed by 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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 equivalents.","units":{"USD":[{"end":"2012-12-31","val":28765000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2012Q4I"},{"end":"2013-12-31","val":32205000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2013Q4I"},{"end":"2014-12-31","val":26971000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"end":"2014-12-31","val":26971000,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2014Q4I"},{"end":"2015-12-31","val":32663000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"end":"2015-12-31","val":32663000,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2015Q4I"},{"end":"2016-12-31","val":19980000,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016Q4I"}]}},"CashAndCashEquivalentsFairValueDisclosure":{"label":"Cash and Cash Equivalents, Fair Value Disclosure","description":"Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. 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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 changes.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":6021000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":-5682000,"accn":"0001193125-12-234677","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":1117000,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2011-01-01","end":"2011-09-30","val":-1570000,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"start":"2011-01-01","end":"2011-12-31","val":8624000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"start":"2011-01-01","end":"2011-12-31","val":8624000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":-7046000,"accn":"0001193125-12-234677","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"start":"2012-01-01","end":"2012-03-31","val":-7046000,"accn":"0001193125-13-217362","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":25618000,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2012-01-01","end":"2012-06-30","val":25618000,"accn":"0001193125-13-331118","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":17607000,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"start":"2012-01-01","end":"2012-09-30","val":17607000,"accn":"0001193125-13-440366","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"},{"start":"2012-01-01","end":"2012-12-31","val":3298000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"start":"2012-01-01","end":"2012-12-31","val":3298000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"start":"2012-01-01","end":"2012-12-31","val":3298000,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-12049000,"accn":"0001193125-13-217362","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14"},{"start":"2013-01-01","end":"2013-03-31","val":-12049000,"accn":"0001193125-14-201111","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":-9087000,"accn":"0001193125-13-331118","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-06-30","val":-9087000,"accn":"0001193125-14-309885","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-01-01","end":"2013-09-30","val":-11448000,"accn":"0001193125-13-440366","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"},{"start":"2013-01-01","end":"2013-09-30","val":-11448000,"accn":"0001193125-14-413393","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"start":"2013-01-01","end":"2013-12-31","val":2137000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"start":"2013-01-01","end":"2013-12-31","val":2137000,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"start":"2013-01-01","end":"2013-12-31","val":3440000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-14662000,"accn":"0001193125-14-201111","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15"},{"start":"2014-01-01","end":"2014-03-31","val":-14662000,"accn":"0001193125-15-187957","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":-16885000,"accn":"0001193125-14-309885","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":-17985000,"accn":"0001193125-15-290585","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"start":"2014-01-01","end":"2014-09-30","val":-22606000,"accn":"0001193125-14-413393","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"start":"2014-01-01","end":"2014-09-30","val":-23937000,"accn":"0001628280-15-008737","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13"},{"start":"2014-01-01","end":"2014-12-31","val":-2686000,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"start":"2014-01-01","end":"2014-12-31","val":-5234000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":14574000,"accn":"0001193125-15-187957","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14"},{"start":"2015-01-01","end":"2015-03-31","val":15540000,"accn":"0001117733-16-000020","fy":2016,"fp":"Q1","form":"10-Q","filed"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Cash Equivalents, and Short-term Investments","description":"Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and 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. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.","units":{"USD":[{"end":"2011-12-31","val":36337000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2011Q4I"},{"end":"2012-12-31","val":40601000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"end":"2012-12-31","val":40601000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2012Q4I"},{"end":"2013-12-31","val":36810000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2013-12-31","val":36810000,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":30649000,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2014-12-31","val":26971000,"accn":"0001628280-15-008737","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13","frame":"CY2014Q4I"},{"end":"2015-03-31","val":51448000,"accn":"0001193125-15-187957","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14","frame":"CY2015Q1I"},{"end":"2015-06-30","val":42722000,"accn":"0001193125-15-290585","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14","frame":"CY2015Q2I"},{"end":"2015-09-30","val":40469000,"accn":"0001628280-15-008737","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13","frame":"CY2015Q3I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents","description":"Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.","units":{"USD":[{"end":"2015-12-31","val":36080000,"accn":"0001117733-17-000145","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"end":"2015-12-31","val":36080000,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2015Q4I"},{"end":"2016-09-30","val":16356000,"accn":"0001117733-17-000145","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02","frame":"CY2016Q3I"},{"end":"2016-12-31","val":19980000,"accn":"0001117733-17-000145","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"end":"2016-12-31","val":19980000,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28"},{"end":"2016-12-31","val":19980000,"accn":"0001117733-18-000044","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02"},{"end":"2016-12-31","val":19980000,"accn":"0001117733-18-000059","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31"},{"end":"2016-12-31","val":19980000,"accn":"0001117733-18-000090","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":11852000,"accn":"0001117733-18-000044","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02","frame":"CY2017Q1I"},{"end":"2017-06-30","val":14748000,"accn":"0001117733-18-000059","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31","frame":"CY2017Q2I"},{"end":"2017-09-30","val":15061000,"accn":"0001117733-17-000145","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"end":"2017-09-30","val":15061000,"accn":"0001117733-18-000090","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-16","frame":"CY2017Q3I"},{"end":"2017-12-31","val":26437000,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28"},{"end":"2017-12-31","val":26437000,"accn":"0001117733-18-000044","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02"},{"end":"2017-12-31","val":26437000,"accn":"0001117733-18-000059","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31"},{"end":"2017-12-31","val":26437000,"accn":"0001117733-18-000090","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-16","frame":"CY2017Q4I"},{"end":"2018-03-31","val":15919000,"accn":"0001117733-18-000044","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02","frame":"CY2018Q1I"},{"end":"2018-06-30","val":15279000,"accn":"0001117733-18-000059","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31","frame":"CY2018Q2I"},{"end":"2018-09-30","val":9470000,"accn":"0001117733-18-000090","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-16","frame":"CY2018Q3I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect","description":"Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.","units":{"USD":[{"start":"2016-01-01","end":"2016-09-30","val":-19724000,"accn":"0001117733-17-000145","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"start":"2016-01-01","end":"2016-12-31","val":-16100000,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":-8128000,"accn":"0001117733-18-000044","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-5232000,"accn":"0001117733-18-000059","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31"},{"start":"2017-01-01","end":"2017-09-30","val":-4919000,"accn":"0001117733-17-000145","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"start":"2017-01-01","end":"2017-09-30","val":-4919000,"accn":"0001117733-18-000090","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-16"},{"start":"2017-01-01","end":"2017-12-31","val":6457000,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":-10518000,"accn":"0001117733-18-000044","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-11158000,"accn":"0001117733-18-000059","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31"},{"start":"2018-01-01","end":"2018-09-30","val":-16967000,"accn":"0001117733-18-000090","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-16"}]}},"CashEquivalentsAtCarryingValue":{"label":"Cash Equivalents, at Carrying Value","description":"Amount of 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. 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or Part Noncash Divestiture, Amount of Consideration Received","description":"Amount of noncash consideration received for selling an asset or business through a noncash (or part noncash) transaction.","units":{"USD":[{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":405000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"start":"2015-01-01","end":"2015-12-31","val":405000,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016"}]}},"NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable":{"label":"Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable","description":"Amount after tax of income (loss) attributable to redeemable noncontrolling preferred unit holders.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":917000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2011"}]}},"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":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":1,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-12-31","val":1,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"start":"2013-01-01","end":"2013-12-31","val":1,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013"},{"start":"2014-01-01","end":"2014-09-30","val":1,"accn":"0001193125-14-413393","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"start":"2014-01-01","end":"2014-12-31","val":1,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"start":"2014-01-01","end":"2014-12-31","val":1,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":1,"accn":"0001193125-15-187957","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":1,"accn":"0001193125-15-290585","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"start":"2015-01-01","end":"2015-09-30","val":1,"accn":"0001628280-15-008737","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13"},{"start":"2015-01-01","end":"2015-12-31","val":1,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":1,"accn":"0001117733-16-000020","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-06","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":1,"accn":"0001117733-16-000029","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"start":"2016-01-01","end":"2016-09-30","val":1,"accn":"0001117733-16-000041","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-12-31","val":1,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016"},{"start":"2018-01-01","end":"2018-03-31","val":1,"accn":"0001117733-18-000044","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":1,"accn":"0001117733-18-000059","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31"},{"start":"2018-01-01","end":"2018-09-30","val":1,"accn":"0001117733-18-000090","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-16"}],"segment":[{"start":"2016-01-01","end":"2016-12-31","val":1,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":1,"accn":"0001117733-17-000043","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-02","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":1,"accn":"0001117733-17-000082","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-27"},{"start":"2017-01-01","end":"2017-09-30","val":1,"accn":"0001117733-17-000145","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"start":"2017-01-01","end":"2017-12-31","val":1,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017"}]}},"NumberOfReportableSegments":{"label":"Number of Reportable Segments","description":"Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.","units":{"Reporting_Unit":[{"start":"2012-01-01","end":"2012-12-31","val":2,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":1,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q1"}],"Segment":[{"start":"2012-01-01","end":"2012-06-30","val":1,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2012-01-01","end":"2012-09-30","val":1,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"start":"2012-01-01","end":"2012-12-31","val":1,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":1,"accn":"0001193125-13-217362","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":1,"accn":"0001193125-13-331118","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-09-30","val":1,"accn":"0001193125-13-440366","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"},{"start":"2013-01-01","end":"2013-12-31","val":1,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":1,"accn":"0001193125-14-201111","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":1,"accn":"0001193125-14-309885","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-09-30","val":1,"accn":"0001193125-14-413393","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"start":"2014-01-01","end":"2014-12-31","val":1,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":1,"accn":"0001193125-15-187957","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":1,"accn":"0001193125-15-290585","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"start":"2015-01-01","end":"2015-09-30","val":1,"accn":"0001628280-15-008737","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13"},{"start":"2015-01-01","end":"2015-12-31","val":1,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":1,"accn":"0001117733-16-000020","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-06","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-12-31","val":1,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016"},{"start":"2018-01-01","end":"2018-03-31","val":1,"accn":"0001117733-18-000044","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":1,"accn":"0001117733-18-000059","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31"},{"start":"2018-01-01","end":"2018-09-30","val":1,"accn":"0001117733-18-000090","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-16"}],"segment":[{"start":"2017-01-01","end":"2017-03-31","val":1,"accn":"0001117733-17-000043","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-02","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":1,"accn":"0001117733-17-000082","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-27"},{"start":"2017-01-01","end":"2017-09-30","val":1,"accn":"0001117733-17-000145","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"start":"2017-01-01","end":"2017-12-31","val":1,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017"}]}},"NumberOfReportingUnits":{"label":"Number of Reporting Units","description":"Number of reporting units tested for impairment of goodwill. 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of Dividends","description":"Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling 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Alternate caption for the concept is permanent equity.","units":{"USD":[{"end":"2011-12-31","val":25620000,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14","frame":"CY2011Q4I"},{"end":"2011-12-31","val":25620000,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2012-06-30","val":90457000,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":89118000,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14","frame":"CY2012Q3I"}]}},"StockholdersEquityNoteStockSplitConversionRatio1":{"label":"Stockholders' Equity Note, Stock Split, Conversion Ratio","description":"Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to 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period.","units":{"shares":[{"start":"2012-01-01","end":"2012-09-30","val":79000,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"start":"2012-01-01","end":"2012-12-31","val":82000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":6000,"accn":"0001193125-13-217362","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":23000,"accn":"0001193125-13-331118","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-09-30","val":35000,"accn":"0001193125-13-440366","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"},{"start":"2013-01-01","end":"2013-12-31","val":39000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":51000,"accn":"0001193125-14-201111","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":51000,"accn":"0001193125-14-309885","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-09-30","val":108000,"accn":"0001193125-14-413393","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"start":"2014-01-01","end":"2014-12-31","val":114000,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":148000,"accn":"0001193125-15-187957","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":148000,"accn":"0001193125-15-290585","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"start":"2015-01-01","end":"2015-09-30","val":148000,"accn":"0001628280-15-008737","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13"},{"start":"2015-01-01","end":"2015-12-31","val":150000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":1000,"accn":"0001117733-16-000020","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-06","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":1000,"accn":"0001117733-16-000029","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"start":"2016-01-01","end":"2016-09-30","val":1000,"accn":"0001117733-16-000041","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-12-31","val":2000,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":0,"accn":"0001117733-17-000043","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-02","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":3000,"accn":"0001117733-17-000082","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-27"},{"start":"2017-01-01","end":"2017-09-30","val":6000,"accn":"0001117733-17-000145","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"start":"2017-01-01","end":"2017-12-31","val":6000,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":0,"accn":"0001117733-18-000044","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":0,"accn":"0001117733-18-000059","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31"},{"start":"2018-01-01","end":"2018-09-30","val":0,"accn":"0001117733-18-000090","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-16"}]}},"StockIssuedDuringPeriodValueAcquisitions":{"label":"Stock Issued During Period, Value, Acquisitions","description":"Value of stock issued pursuant to acquisitions during the period.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":4000000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2011"},{"start":"2012-01-01","end":"2012-06-30","val":830000,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2012-01-01","end":"2012-06-30","val":830000,"accn":"0001193125-13-331118","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2012-01-01","end":"2012-09-30","val":830000,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"start":"2012-01-01","end":"2012-09-30","val":830000,"accn":"0001193125-13-440366","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"},{"start":"2012-01-01","end":"2012-12-31","val":830000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"start":"2012-01-01","end":"2012-12-31","val":830000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"start":"2012-01-01","end":"2012-12-31","val":830000,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2012"}]}},"StockIssuedDuringPeriodValueConversionOfUnits":{"label":"Stock Issued During Period, Value, Conversion of Units","description":"Value of stock issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).","units":{"USD":[{"start":"2012-01-01","end":"2012-06-30","val":22811000,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2012-01-01","end":"2012-09-30","val":22811000,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"start":"2012-01-01","end":"2012-12-31","val":22811000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"start":"2012-01-01","end":"2012-12-31","val":22811000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"start":"2012-01-01","end":"2012-12-31","val":22811000,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2012"}]}},"StockIssuedDuringPeriodValueNewIssues":{"label":"Stock Issued During Period, Value, New Issues","description":"Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.","units":{"USD":[{"start":"2012-01-01","end":"2012-09-30","val":39589000,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"start":"2012-01-01","end":"2012-12-31","val":39589000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"start":"2012-01-01","end":"2012-12-31","val":39589000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"start":"2012-01-01","end":"2012-12-31","val":39589000,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2012"}]}},"StockIssuedDuringPeriodValueShareBasedCompensation":{"label":"Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture","description":"Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).","units":{"USD":[{"start":"2012-01-01","end":"2012-12-31","val":298000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"start":"2012-01-01","end":"2012-12-31","val":298000,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":60000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"start":"2013-01-01","end":"2013-12-31","val":60000,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"start":"2013-01-01","end":"2013-12-31","val":60000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":451000,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"start":"2014-01-01","end":"2014-12-31","val":451000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":399000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"start":"2015-01-01","end":"2015-12-31","val":399000,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":5000,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10"},{"start":"2016-01-01","end":"2016-12-31","val":5000,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":13000,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017"}]}},"StockIssuedDuringPeriodValueStockOptionsExercised":{"label":"Stock Issued During Period, Value, Stock Options Exercised","description":"Value of stock issued as a result of the exercise of stock options.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":1878000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2011"},{"start":"2012-01-01","end":"2012-06-30","val":204000,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2012-01-01","end":"2012-09-30","val":287000,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"start":"2012-01-01","end":"2012-12-31","val":298000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012"}]}},"StockRepurchasedAndRetiredDuringPeriodShares":{"label":"Stock Repurchased and Retired During Period, Shares","description":"Number of shares that have been repurchased and retired during the period.","units":{"shares":[{"start":"2015-01-01","end":"2015-06-30","val":489000,"accn":"0001117733-16-000029","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"start":"2015-04-01","end":"2015-06-30","val":489000,"accn":"0001117733-16-000029","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04","frame":"CY2015Q2"},{"start":"2015-01-01","end":"2015-09-30","val":638000,"accn":"0001117733-16-000041","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2015-07-01","end":"2015-09-30","val":148000,"accn":"0001117733-16-000041","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q3"},{"start":"2016-01-01","end":"2016-03-31","val":98000,"accn":"0001117733-16-000029","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"start":"2016-01-01","end":"2016-03-31","val":77000,"accn":"0001117733-16-000041","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-03-31","val":48000,"accn":"0001117733-17-000043","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-02","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":146000,"accn":"0001117733-16-000029","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"start":"2016-01-01","end":"2016-06-30","val":146000,"accn":"0001117733-17-000082","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-27"},{"start":"2016-04-01","end":"2016-06-30","val":98000,"accn":"0001117733-17-000082","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-27","frame":"CY2016Q2"},{"start":"2016-01-01","end":"2016-09-30","val":223000,"accn":"0001117733-16-000041","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"start":"2016-01-01","end":"2016-09-30","val":223000,"accn":"0001117733-17-000145","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"start":"2016-07-01","end":"2016-09-30","val":77000,"accn":"0001117733-17-000145","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02","frame":"CY2016Q3"},{"start":"2017-01-01","end":"2017-03-31","val":19000,"accn":"0001117733-17-000043","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-02","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":19000,"accn":"0001117733-17-000082","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-27"},{"start":"2017-04-01","end":"2017-06-30","val":0,"accn":"0001117733-17-000082","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-27","frame":"CY2017Q2"},{"start":"2017-01-01","end":"2017-09-30","val":19000,"accn":"0001117733-17-000145","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"start":"2017-07-01","end":"2017-09-30","val":0,"accn":"0001117733-17-000145","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02","frame":"CY2017Q3"}]}},"StockRepurchasedDuringPeriodShares":{"label":"Stock Repurchased During Period, Shares","description":"Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.","units":{"shares":[{"start":"2015-01-01","end":"2015-12-31","val":931664,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"start":"2015-01-01","end":"2015-12-31","val":931664,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":315503,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10"},{"start":"2016-01-01","end":"2016-12-31","val":315503,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":18861,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017"}]}},"StockRepurchasedDuringPeriodValue":{"label":"Stock Repurchased During Period, Value","description":"Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.","units":{"USD":[{"start":"2015-01-01","end":"2015-12-31","val":4184000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"start":"2015-01-01","end":"2015-12-31","val":4184000,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":1021000,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10"},{"start":"2016-01-01","end":"2016-12-31","val":1021000,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":58000,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017"}]}},"StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased":{"label":"Stock Repurchase Program, Number of Shares Authorized to be Repurchased","description":"The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.","units":{"shares":[{"end":"2015-05-31","val":3500000,"accn":"0001193125-15-290585","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"end":"2015-05-31","val":3500000,"accn":"0001628280-15-008737","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13"},{"end":"2015-05-31","val":3500000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"end":"2015-05-31","val":3500000,"accn":"0001117733-16-000020","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-06"},{"end":"2015-05-31","val":3500000,"accn":"0001117733-16-000029","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"end":"2015-05-31","val":3500000,"accn":"0001117733-16-000041","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2015Q2I"},{"end":"2016-04-30","val":3500000,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10"},{"end":"2016-04-30","val":3500000,"accn":"0001117733-17-000043","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-02"},{"end":"2016-04-30","val":3500000,"accn":"0001117733-17-000082","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-27"},{"end":"2016-04-30","val":3500000,"accn":"0001117733-17-000145","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"end":"2016-04-30","val":3500000,"accn":"0001117733-18-000023","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2016Q1I"}]}},"TemporaryEquityCarryingAmount":{"label":"Temporary Equity, Carrying Amount (Deprecated 2012-01-31)","description":"The carrying value (book value) of an entity's issued and outstanding stock which is not included within permanent equity in Stockholders Equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.","units":{"USD":[{"end":"2011-12-31","val":22811000,"accn":"0001193125-12-234677","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2011Q4I"},{"end":"2012-03-31","val":22811000,"accn":"0001193125-12-234677","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"}]}},"TemporaryEquityCarryingAmountAttributableToParent":{"label":"Temporary Equity, Carrying Amount, Attributable to Parent","description":"Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.","units":{"USD":[{"end":"2011-12-31","val":22811000,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":22811000,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"end":"2011-12-31","val":22811000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"end":"2011-12-31","val":22811000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2011-12-31","val":22800000,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2011Q4I"},{"end":"2012-12-31","val":0,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"}]}},"TemporaryEquityLiquidationPreference":{"label":"Temporary Equity, Liquidation Preference","description":"The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.","units":{"USD":[{"end":"2011-12-31","val":17902000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2011Q4I"},{"end":"2011-12-31","val":17902000,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"end":"2011-12-31","val":17902000,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":17902000,"accn":"0001193125-12-234677","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2012-03-31","val":17902000,"accn":"0001193125-12-234677","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2012-06-30","val":0,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":0,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14","frame":"CY2012Q3I"},{"end":"2012-12-31","val":0,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"}]}},"TemporaryEquityParOrStatedValuePerShare":{"label":"Temporary Equity, Par or Stated Value Per Share","description":"Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.","units":{"USD/shares":[{"end":"2011-12-31","val":0.0001,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2011Q4I"},{"end":"2011-12-31","val":0.0001,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"end":"2011-12-31","val":0.0001,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":0.0001,"accn":"0001193125-12-234677","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2012-03-31","val":0.0001,"accn":"0001193125-12-234677","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2012-06-30","val":0.0001,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":0.0001,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14","frame":"CY2012Q3I"},{"end":"2012-12-31","val":0.0001,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"}]}},"TemporaryEquitySharesAuthorized":{"label":"Temporary Equity, Shares Authorized","description":"The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.","units":{"shares":[{"end":"2011-12-31","val":12345000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2011Q4I"},{"end":"2011-12-31","val":12345,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"end":"2011-12-31","val":12345,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":12345000,"accn":"0001193125-12-234677","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2012-03-31","val":12345000,"accn":"0001193125-12-234677","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2012-06-30","val":0,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":0,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14","frame":"CY2012Q3I"},{"end":"2012-12-31","val":0,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"}]}},"TemporaryEquitySharesIssued":{"label":"Temporary Equity, Shares Issued","description":"The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.","units":{"shares":[{"end":"2011-12-31","val":5535000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2011Q4I"},{"end":"2011-12-31","val":5535,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"end":"2011-12-31","val":5535,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":5535000,"accn":"0001193125-12-234677","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2012-03-31","val":5535000,"accn":"0001193125-12-234677","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2012-06-30","val":0,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":0,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14","frame":"CY2012Q3I"},{"end":"2012-12-31","val":0,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"}]}},"TemporaryEquitySharesOutstanding":{"label":"Temporary Equity, Shares Outstanding","description":"The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.","units":{"shares":[{"end":"2011-12-31","val":5535000,"accn":"0001193125-12-234677","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2011-12-31","val":5535,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":5535,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"end":"2011-12-31","val":5535000,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"end":"2011-12-31","val":5535000,"accn":"0001193125-14-124061","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2011-12-31","val":5534963,"accn":"0001193125-15-114440","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2011Q4I"},{"end":"2012-03-31","val":5535000,"accn":"0001193125-12-234677","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2012-06-30","val":0,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":0,"accn":"0001193125-12-470793","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14","frame":"CY2012Q3I"},{"end":"2012-12-31","val":0,"accn":"0001193125-13-112850","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"}]}},"TemporaryEquityStockIssuedDuringPeriodValueNewIssues":{"label":"Temporary Equity, Stock Issued During Period, Value, New Issues","description":"Value of new stock classified as temporary equity issued during the period.","units":{"USD":[{"start":"2012-01-01","end":"2012-06-30","val":39589000,"accn":"0001193125-12-355576","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"}]}},"TreasuryStockAcquiredAverageCostPerShare":{"label":"Treasury Stock Acquired, Average Cost Per Share","description":"Total cost of shares repurchased divided by the total number of shares 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Stock, Shares","description":"Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.","units":{"shares":[{"end":"2014-12-31","val":0,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2014Q4I"},{"end":"2015-12-31","val":50000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"end":"2015-12-31","val":50000,"accn":"0001117733-16-000020","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-06"},{"end":"2015-12-31","val":50000,"accn":"0001117733-16-000029","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"end":"2015-12-31","val":50000,"accn":"0001117733-16-000041","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":50000,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2015Q4I"},{"end":"2016-03-31","val":50000,"accn":"0001117733-16-000020","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-06","frame":"CY2016Q1I"},{"end":"2016-06-30","val":0,"accn":"0001117733-16-000029","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04","frame":"CY2016Q2I"},{"end":"2016-09-30","val":0,"accn":"0001117733-16-000041","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":0,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016Q4I"}]}},"TreasuryStockValue":{"label":"Treasury Stock, Value","description":"The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.","units":{"USD":[{"end":"2014-12-31","val":0,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2014Q4I"},{"end":"2015-12-31","val":203000,"accn":"0001117733-16-000012","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"end":"2015-12-31","val":203000,"accn":"0001117733-16-000020","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-06"},{"end":"2015-12-31","val":203000,"accn":"0001117733-16-000029","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"end":"2015-12-31","val":203000,"accn":"0001117733-16-000041","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10"},{"end":"2015-12-31","val":203000,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2015Q4I"},{"end":"2016-03-31","val":203000,"accn":"0001117733-16-000020","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-06","frame":"CY2016Q1I"},{"end":"2016-06-30","val":0,"accn":"0001117733-16-000029","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04","frame":"CY2016Q2I"},{"end":"2016-09-30","val":0,"accn":"0001117733-16-000041","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-10","frame":"CY2016Q3I"},{"end":"2016-12-31","val":0,"accn":"0001117733-17-000018","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016Q4I"}]}},"TreasuryStockValueAcquiredCostMethod":{"label":"Treasury Stock, Value, Acquired, Cost Method","description":"Equity impact of the cost of common and preferred stock that were repurchased during the period. 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