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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' 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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 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Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).","units":{"USD":[{"end":"2013-12-31","val":697000,"accn":"0000104918-14-000124","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-05","frame":"CY2013Q4I"},{"end":"2013-12-31","val":697000,"accn":"0000104918-14-000098","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08"},{"end":"2014-06-30","val":98314000,"accn":"0000104918-14-000098","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08","frame":"CY2014Q2I"},{"end":"2014-09-30","val":7581000,"accn":"0000104918-14-000124","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-05","frame":"CY2014Q3I"},{"end":"2014-12-31","val":173000,"accn":"0000104918-15-000068","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-06","frame":"CY2014Q4I"},{"end":"2015-03-31","val":20335000,"accn":"0000104918-15-000068","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-06","frame":"CY2015Q1I"},{"end":"2017-12-31","val":413000,"accn":"0000104918-18-000060","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02","frame":"CY2017Q4I"},{"end":"2018-03-31","val":15845000,"accn":"0000104918-18-000060","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02","frame":"CY2018Q1I"},{"end":"2018-12-31","val":141000,"accn":"0000104918-19-000084","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-01","frame":"CY2018Q4I"},{"end":"2019-03-31","val":20368000,"accn":"0000104918-19-000084","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-01","frame":"CY2019Q1I"},{"end":"2019-12-31","val":298000,"accn":"0001564590-20-036356","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-05","frame":"CY2019Q4I"},{"end":"2019-12-31","val":298000,"accn":"0000104918-20-000069","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-08"},{"end":"2020-03-31","val":5199000,"accn":"0000104918-20-000069","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-08","frame":"CY2020Q1I"},{"end":"2020-06-30","val":0,"accn":"0001564590-20-036356","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-05","frame":"CY2020Q2I"}]}},"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":"2009-12-31","val":34833000,"accn":"0001193125-11-047407","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25","frame":"CY2009Q4I"},{"end":"2009-12-31","val":34833000,"accn":"0001193125-10-241161","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-29"},{"end":"2009-12-31","val":34833000,"accn":"0001193125-10-181162","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06"},{"end":"2010-06-30","val":37461000,"accn":"0001193125-10-181162","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06","frame":"CY2010Q2I"},{"end":"2010-09-30","val":43153000,"accn":"0001193125-10-241161","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-29","frame":"CY2010Q3I"},{"end":"2010-12-31","val":46722000,"accn":"0001193125-11-297310","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-04","frame":"CY2010Q4I"},{"end":"2010-12-31","val":46722000,"accn":"0001193125-11-212343","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05"},{"end":"2010-12-31","val":46722000,"accn":"0001193125-11-130556","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-06"},{"end":"2010-12-31","val":46722000,"accn":"0001193125-11-047407","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25"},{"end":"2011-03-31","val":42817000,"accn":"0001193125-11-130556","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-06","frame":"CY2011Q1I"},{"end":"2011-06-30","val":52367000,"accn":"0001193125-11-212343","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05","frame":"CY2011Q2I"},{"end":"2011-09-30","val":52070000,"accn":"0001193125-11-297310","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-04","frame":"CY2011Q3I"}]}},"TreasuryStockAcquiredAverageCostPerShare":{"label":"Treasury Stock Acquired, Average Cost Per Share","description":"Total cost of shares repurchased divided by the total number of shares repurchased.","units":{"USD/shares":[{"start":"2014-07-01","end":"2014-07-31","val":32.3,"accn":"0000104918-14-000124","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-05"},{"start":"2014-08-01","end":"2014-08-31","val":31.5,"accn":"0000104918-14-000124","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-05"},{"start":"2014-07-01","end":"2014-09-30","val":31.68,"accn":"0000104918-14-000124","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-05","frame":"CY2014Q3"},{"start":"2014-09-01","end":"2014-09-30","val":31.67,"accn":"0000104918-14-000124","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-05"},{"start":"2014-01-01","end":"2014-12-31","val":31.57,"accn":"0000104918-17-000053","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22","frame":"CY2014"},{"start":"2014-07-07","end":"2014-12-31","val":31.57,"accn":"0000104918-16-000185","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-24"},{"start":"2014-07-07","end":"2014-12-31","val":31.57,"accn":"0000104918-15-000044","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-25"},{"start":"2015-01-01","end":"2015-03-31","val":32.66,"accn":"0000104918-16-000185","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-24","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-03-31","val":32.66,"accn":"0000104918-15-000068","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-06"},{"start":"2015-01-01","end":"2015-06-30","val":32.66,"accn":"0000104918-15-000104","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-05"},{"start":"2015-01-01","end":"2015-09-30","val":32.66,"accn":"0000104918-15-000125","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-04"},{"start":"2015-01-01","end":"2015-12-31","val":32.66,"accn":"0000104918-18-000043","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2015"},{"start":"2015-01-01","end":"2015-12-31","val":32.66,"accn":"0000104918-17-000053","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"}]}},"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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