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For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.","units":{"USD":[{"end":"2010-12-31","val":213326000,"accn":"0001193125-11-212277","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05"},{"end":"2010-12-31","val":213326000,"accn":"0001193125-11-297006","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-04"},{"end":"2010-12-31","val":213326000,"accn":"0001193125-12-109956","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-12","frame":"CY2010Q4I"},{"end":"2011-06-30","val":213360000,"accn":"0001193125-11-212277","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05","frame":"CY2011Q2I"},{"end":"2011-09-30","val":213349000,"accn":"0001193125-11-297006","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-04","frame":"CY2011Q3I"},{"end":"2011-12-31","val":213282000,"accn":"0001193125-12-109956","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-12"},{"end":"2011-12-31","val":213282000,"accn":"0001193125-12-213886","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-07"},{"end":"2011-12-31","val":213282000,"accn":"0001193125-12-337497","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-06"},{"end":"2011-12-31","val":213282000,"accn":"0001193125-12-448509","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-02"},{"end":"2011-12-31","val":213282000,"accn":"0001193125-13-097839","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2011Q4I"},{"end":"2012-03-31","val":213257000,"accn":"0001193125-12-213886","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-07","frame":"CY2012Q1I"},{"end":"2012-06-30","val":213366000,"accn":"0001193125-12-337497","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-06","frame":"CY2012Q2I"},{"end":"2012-09-30","val":213306000,"accn":"0001193125-12-448509","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-02","frame":"CY2012Q3I"},{"end":"2012-12-31","val":213238000,"accn":"0001193125-13-097839","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"end":"2012-12-31","val":213238000,"accn":"0001193125-13-200713","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-06"},{"end":"2012-12-31","val":213238000,"accn":"0001193125-13-316942","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-02"},{"end":"2012-12-31","val":213238000,"accn":"0001193125-13-420490","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-31"},{"end":"2012-12-31","val":213238000,"accn":"0001193125-14-091264","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-10","frame":"CY2012Q4I"},{"end":"2013-03-31","val":212646000,"accn":"0001193125-13-200713","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-06","frame":"CY2013Q1I"},{"end":"2013-06-30","val":212382000,"accn":"0001193125-13-316942","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-02","frame":"CY2013Q2I"},{"end":"2013-09-30","val":212170000,"accn":"0001193125-13-420490","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-31","frame":"CY2013Q3I"},{"end":"2013-12-31","val":211852000,"accn":"0001193125-14-091264","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-10"},{"end":"2013-12-31","val":211852000,"accn":"0001193125-14-179895","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-02"},{"end":"2013-12-31","val":211852000,"accn":"0001193125-14-291231","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-01"},{"end":"2013-12-31","val":211852000,"accn":"0001193125-14-391620","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-31"},{"end":"2013-12-31","val":211852000,"accn":"0001193125-15-073068","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-02","frame":"CY2013Q4I"},{"end":"2014-03-31","val":211467000,"accn":"0001193125-14-179895","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-02","frame":"CY2014Q1I"},{"end":"2014-06-30","val":211169000,"accn":"0001193125-14-291231","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-01","frame":"CY2014Q2I"},{"end":"2014-09-30","val":210944000,"accn":"0001193125-14-391620","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-31","frame":"CY2014Q3I"},{"end":"2014-12-31","val":210989000,"accn":"0001193125-15-073068","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-02","frame":"CY2014Q4I"}]}},"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 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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":"2016-12-31","val":19693000,"accn":"0001193125-18-243708","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"end":"2016-12-31","val":19693000,"accn":"0001193125-18-323498","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09","frame":"CY2016Q4I"},{"end":"2017-06-30","val":13092000,"accn":"0001193125-18-243708","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09","frame":"CY2017Q2I"},{"end":"2017-09-30","val":12796000,"accn":"0001193125-18-323498","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":15398000,"accn":"0001193125-18-243708","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"end":"2017-12-31","val":15398000,"accn":"0001193125-18-323498","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09","frame":"CY2017Q4I"},{"end":"2018-06-30","val":8233000,"accn":"0001193125-18-243708","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09","frame":"CY2018Q2I"},{"end":"2018-09-30","val":9444000,"accn":"0001193125-18-323498","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09","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":"2017-01-01","end":"2017-06-30","val":-6601000,"accn":"0001193125-18-243708","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"start":"2017-01-01","end":"2017-09-30","val":-6897000,"accn":"0001193125-18-323498","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09"},{"start":"2018-01-01","end":"2018-06-30","val":-7165000,"accn":"0001193125-18-243708","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"start":"2018-01-01","end":"2018-09-30","val":-5954000,"accn":"0001193125-18-323498","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09"}]}},"CommonStockParOrStatedValuePerShare":{"label":"Common Stock, Par or Stated Value Per Share","description":"Face amount or stated value per 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This item includes treasury stock repurchased by the entity. 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Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an 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. 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