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Alternate caption for the concept is permanent 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Excludes shares or units issued under employee stock ownership plan 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Benefit from Stock Options Exercised (Deprecated 2012-01-31)","description":"Reductions in the entity's income taxes that arise when compensation cost (from non-qualified stock options) recognized on the entity's tax return exceeds compensation cost from non-qualified stock options recognized on the income statement. This element increases net cash provided by operating activities.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-78000,"accn":"0001193125-12-114351","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":-288000,"accn":"0001193125-11-215958","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"start":"2010-01-01","end":"2010-09-30","val":-572000,"accn":"0001193125-11-299361","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"start":"2010-01-01","end":"2010-12-31","val":341000,"accn":"0001193125-12-114351","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2010"},{"start":"2011-01-01","end":"2011-06-30","val":-787000,"accn":"0001193125-11-215958","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"start":"2011-01-01","end":"2011-09-30","val":-830000,"accn":"0001193125-11-299361","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"start":"2011-01-01","end":"2011-12-31","val":630000,"accn":"0001193125-12-114351","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2011"}]}},"TaxBenefitFromStockOptionsExercised1":{"label":"Tax Benefit from Stock Options Exercised (Deprecated 2013-01-31)","description":"Tax benefits realized from the exercise of stock options resulting in reductions in the entity's income taxes, which increases net cash provided by operating activities.","units":{"USD":[{"start":"2011-01-01","end":"2011-06-30","val":-787000,"accn":"0001193125-12-343560","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"start":"2011-01-01","end":"2011-09-30","val":-830000,"accn":"0001193125-12-443382","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-31"},{"start":"2012-01-01","end":"2012-06-30","val":-318000,"accn":"0001193125-12-343560","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"start":"2012-01-01","end":"2012-09-30","val":-318000,"accn":"0001193125-12-443382","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-31"}]}},"TaxesPayableCurrent":{"label":"Taxes Payable, Current","description":"Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).","units":{"USD":[{"end":"2011-12-31","val":5737000,"accn":"0001193125-13-111548","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2011Q4I"},{"end":"2012-12-31","val":5550000,"accn":"0001193125-13-111548","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"end":"2012-12-31","val":5550000,"accn":"0001193125-14-048080","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-12","frame":"CY2012Q4I"},{"end":"2013-12-31","val":4797000,"accn":"0001193125-14-048080","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-12"},{"end":"2013-12-31","val":4530000,"accn":"0001193125-15-038673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-09","frame":"CY2013Q4I"},{"end":"2014-12-31","val":5720000,"accn":"0001193125-15-038673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-09","frame":"CY2014Q4I"}]}},"TemporaryEquityAccretionToRedemptionValueAdjustment":{"label":"Temporary Equity, Accretion to Redemption Value, Adjustment","description":"Amount of decrease to net income for accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders.","units":{"USD":[{"start":"2011-01-01","end":"2011-06-30","val":130000,"accn":"0001193125-11-215958","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"start":"2011-04-01","end":"2011-06-30","val":115000,"accn":"0001193125-11-215958","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":214000,"accn":"0001193125-12-443382","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-31"},{"start":"2011-01-01","end":"2011-09-30","val":214000,"accn":"0001193125-11-299361","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"start":"2011-07-01","end":"2011-09-30","val":84000,"accn":"0001193125-12-443382","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-31","frame":"CY2011Q3"},{"start":"2011-07-01","end":"2011-09-30","val":84000,"accn":"0001193125-11-299361","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"start":"2012-01-01","end":"2012-09-30","val":295000,"accn":"0001193125-12-443382","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-31"},{"start":"2012-07-01","end":"2012-09-30","val":103000,"accn":"0001193125-12-443382","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-31","frame":"CY2012Q3"}]}},"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":349023000,"accn":"0001193125-12-343560","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"end":"2011-12-31","val":349023000,"accn":"0001193125-12-443382","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-31"},{"end":"2011-12-31","val":349023000,"accn":"0001193125-13-111548","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2011Q4I"},{"end":"2012-06-30","val":363386000,"accn":"0001193125-12-343560","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2012Q2I"},{"end":"2012-09-30","val":370908000,"accn":"0001193125-12-443382","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-31","frame":"CY2012Q3I"},{"end":"2012-12-31","val":378474000,"accn":"0001193125-13-111548","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"end":"2012-12-31","val":378474000,"accn":"0001193125-13-179919","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-29"},{"end":"2012-12-31","val":378474000,"accn":"0001193125-13-302011","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-25"},{"end":"2012-12-31","val":378474000,"accn":"0001193125-13-403460","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-18"},{"end":"2012-12-31","val":378474000,"accn":"0001193125-14-048080","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-12","frame":"CY2012Q4I"},{"end":"2013-03-31","val":386089000,"accn":"0001193125-13-179919","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-29","frame":"CY2013Q1I"},{"end":"2013-06-30","val":393961000,"accn":"0001193125-13-302011","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-25","frame":"CY2013Q2I"},{"end":"2013-09-30","val":402081000,"accn":"0001193125-13-403460","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-18","frame":"CY2013Q3I"},{"end":"2013-12-31","val":410371000,"accn":"0001193125-14-048080","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-12"},{"end":"2013-12-31","val":410371000,"accn":"0001193125-14-148404","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-18"},{"end":"2013-12-31","val":410371000,"accn":"0001193125-14-281999","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-28"},{"end":"2013-12-31","val":410371000,"accn":"0001193125-14-378061","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-22"},{"end":"2013-12-31","val":410371000,"accn":"0001193125-15-038673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-09","frame":"CY2013Q4I"},{"end":"2014-03-31","val":418649000,"accn":"0001193125-14-148404","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-18","frame":"CY2014Q1I"},{"end":"2014-06-30","val":427184000,"accn":"0001193125-14-281999","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-28","frame":"CY2014Q2I"},{"end":"2014-09-30","val":435989000,"accn":"0001193125-14-378061","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-22","frame":"CY2014Q3I"},{"end":"2014-12-31","val":0,"accn":"0001193125-15-038673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-09"},{"end":"2014-12-31","val":0,"accn":"0001193125-15-173796","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-06","frame":"CY2014Q4I"},{"end":"2015-03-31","val":0,"accn":"0001193125-15-173796","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-06","frame":"CY2015Q1I"}]}},"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":480000,"accn":"0001193125-12-343560","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"end":"2011-12-31","val":480000,"accn":"0001193125-12-443382","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-31"},{"end":"2011-12-31","val":480000,"accn":"0001193125-13-111548","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2011Q4I"},{"end":"2012-06-30","val":480000,"accn":"0001193125-12-343560","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2012Q2I"},{"end":"2012-09-30","val":480000,"accn":"0001193125-12-443382","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-31","frame":"CY2012Q3I"},{"end":"2012-12-31","val":480000,"accn":"0001193125-13-111548","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"end":"2012-12-31","val":480000,"accn":"0001193125-13-179919","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-29"},{"end":"2012-12-31","val":480000,"accn":"0001193125-13-302011","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-25"},{"end":"2012-12-31","val":480000,"accn":"0001193125-13-403460","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-18"},{"end":"2012-12-31","val":480000,"accn":"0001193125-14-048080","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-12","frame":"CY2012Q4I"},{"end":"2013-03-31","val":480000,"accn":"0001193125-13-179919","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-29","frame":"CY2013Q1I"},{"end":"2013-06-30","val":480000,"accn":"0001193125-13-302011","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-25","frame":"CY2013Q2I"},{"end":"2013-09-30","val":480000,"accn":"0001193125-13-403460","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-18","frame":"CY2013Q3I"},{"end":"2013-12-31","val":480000,"accn":"0001193125-14-048080","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-12"},{"end":"2013-12-31","val":480000,"accn":"0001193125-14-148404","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-18"},{"end":"2013-12-31","val":480000,"accn":"0001193125-14-281999","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-28"},{"end":"2013-12-31","val":480000,"accn":"0001193125-14-378061","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-22"},{"end":"2013-12-31","val":480000,"accn":"0001193125-15-038673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-09","frame":"CY2013Q4I"},{"end":"2014-03-31","val":480000,"accn":"0001193125-14-148404","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-18","frame":"CY2014Q1I"},{"end":"2014-06-30","val":480000,"accn":"0001193125-14-281999","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-28","frame":"CY2014Q2I"},{"end":"2014-09-30","val":480000,"accn":"0001193125-14-378061","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-22","frame":"CY2014Q3I"},{"end":"2014-12-31","val":480000,"accn":"0001193125-15-038673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-09"},{"end":"2014-12-31","val":480000,"accn":"0001193125-15-173796","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-06","frame":"CY2014Q4I"},{"end":"2015-03-31","val":480000,"accn":"0001193125-15-173796","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-06","frame":"CY2015Q1I"}]}},"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":330000,"accn":"0001193125-12-343560","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"end":"2011-12-31","val":330000,"accn":"0001193125-12-443382","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-31"},{"end":"2011-12-31","val":330000,"accn":"0001193125-13-111548","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2011Q4I"},{"end":"2012-06-30","val":330000,"accn":"0001193125-12-343560","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2012Q2I"},{"end":"2012-09-30","val":330000,"accn":"0001193125-12-443382","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-31","frame":"CY2012Q3I"},{"end":"2012-12-31","val":330000,"accn":"0001193125-13-111548","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"end":"2012-12-31","val":330000,"accn":"0001193125-13-179919","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-29"},{"end":"2012-12-31","val":330000,"accn":"0001193125-13-302011","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-25"},{"end":"2012-12-31","val":330000,"accn":"0001193125-13-403460","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-18"},{"end":"2012-12-31","val":330000,"accn":"0001193125-14-048080","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-12","frame":"CY2012Q4I"},{"end":"2013-03-31","val":330000,"accn":"0001193125-13-179919","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-29","frame":"CY2013Q1I"},{"end":"2013-06-30","val":330000,"accn":"0001193125-13-302011","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-25","frame":"CY2013Q2I"},{"end":"2013-09-30","val":330000,"accn":"0001193125-13-403460","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-18","frame":"CY2013Q3I"},{"end":"2013-12-31","val":330000,"accn":"0001193125-14-048080","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-12"},{"end":"2013-12-31","val":330000,"accn":"0001193125-14-148404","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-18"},{"end":"2013-12-31","val":330000,"accn":"0001193125-14-281999","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-28"},{"end":"2013-12-31","val":330000,"accn":"0001193125-14-378061","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-22"},{"end":"2013-12-31","val":330000,"accn":"0001193125-15-038673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-09","frame":"CY2013Q4I"},{"end":"2014-03-31","val":330000,"accn":"0001193125-14-148404","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-18","frame":"CY2014Q1I"},{"end":"2014-06-30","val":330000,"accn":"0001193125-14-281999","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-28","frame":"CY2014Q2I"},{"end":"2014-09-30","val":330000,"accn":"0001193125-14-378061","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-22","frame":"CY2014Q3I"},{"end":"2014-12-31","val":0,"accn":"0001193125-15-038673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-09","frame":"CY2014Q4I"}]}},"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. 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