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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 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future.","units":{"USD":[{"end":"2012-12-31","val":750000,"accn":"0001193125-13-207780","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-08"},{"end":"2012-12-31","val":750000,"accn":"0001193125-13-329003","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09"},{"end":"2012-12-31","val":750000,"accn":"0001445305-13-002759","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-06","frame":"CY2012Q4I"},{"end":"2013-03-31","val":1600000,"accn":"0001193125-13-207780","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-08","frame":"CY2013Q1I"},{"end":"2013-06-30","val":500000,"accn":"0001193125-13-329003","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09","frame":"CY2013Q2I"},{"end":"2013-09-30","val":3250000,"accn":"0001445305-13-002759","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-06","frame":"CY2013Q3I"},{"end":"2013-12-31","val":4100000,"accn":"0001456016-14-000056","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15"},{"end":"2013-12-31","val":4100000,"accn":"0001456016-14-000066","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08"},{"end":"2013-12-31","val":4100000,"accn":"0001456016-14-000086","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06","frame":"CY2013Q4I"},{"end":"2014-03-31","val":1000000,"accn":"0001456016-14-000056","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15","frame":"CY2014Q1I"},{"end":"2014-06-30","val":0,"accn":"0001456016-14-000066","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08","frame":"CY2014Q2I"},{"end":"2014-09-30","val":1500000,"accn":"0001456016-14-000086","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06","frame":"CY2014Q3I"},{"end":"2014-12-31","val":0,"accn":"0001456016-15-000042","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2014Q4I"},{"end":"2015-03-31","val":1000000,"accn":"0001456016-15-000042","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"}]}},"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. 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ayments 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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":"2012-12-31","val":4900000,"accn":"0001193125-13-084105","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":4900000,"accn":"0001456016-14-000022","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-11","frame":"CY2013Q4I"},{"end":"2014-12-31","val":56421000,"accn":"0001456016-15-000042","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13"},{"end":"2014-12-31","val":56421000,"accn":"0001456016-15-000057","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-13"},{"end":"2014-12-31","val":56421000,"accn":"0001456016-16-000089","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-10","frame":"CY2014Q4I"},{"end":"2015-03-31","val":68771000,"accn":"0001456016-15-000042","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-13","frame":"CY2015Q1I"},{"end":"2015-06-30","val":81130000,"accn":"0001456016-15-000057","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-13","frame":"CY2015Q2I"},{"end":"2015-12-31","val":86557000,"accn":"0001456016-16-000089","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-10"},{"end":"2015-12-31","val":86557000,"accn":"0001456016-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":92058000,"accn":"0001456016-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-15","frame":"CY2016Q4I"}]}},"TemporaryEquityRedemptionPricePerShare":{"label":"Temporary Equity, Redemption Price Per Share","description":"Amount to be paid per share that is classified as temporary equity by entity upon redemption. 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/shares":[{"end":"2011-12-31","val":9.38,"accn":"0001193125-12-371304","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2012-08-28","frame":"CY2011Q4I"},{"end":"2012-06-30","val":9.81,"accn":"0001193125-12-371304","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2012-08-28","frame":"CY2012Q2I"},{"end":"2012-07-31","val":9.78,"accn":"0001193125-12-371304","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2012-08-28"}]}},"TemporaryEquityRedemptionValue":{"label":"Temporary Equity, Redemption Value (Deprecated 2014-01-31)","description":"The aggregate amount to be paid by the entity upon redemption of the security that is 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. 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. 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