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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 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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":"2016-12-31","val":3499000,"accn":"0001303313-17-000030","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-09"},{"end":"2016-12-31","val":3499000,"accn":"0001303313-17-000038","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-04"},{"end":"2016-12-31","val":3499000,"accn":"0001303313-17-000055","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-03"},{"end":"2016-12-31","val":3499000,"accn":"0001303313-17-000062","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-06"},{"end":"2016-12-31","val":3499000,"accn":"0001303313-18-000005","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01","frame":"CY2016Q4I"},{"end":"2017-03-31","val":3663000,"accn":"0001303313-17-000038","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-04","frame":"CY2017Q1I"},{"end":"2017-12-31","val":0,"accn":"0001303313-18-000005","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01"},{"end":"2017-12-31","val":0,"accn":"0001303313-18-000078","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-01","frame":"CY2017Q4I"},{"end":"2018-09-30","val":877000,"accn":"0001303313-18-000078","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-01","frame":"CY2018Q3I"},{"end":"2019-12-31","val":0,"accn":"0001303313-21-000009","fy":2020,"fp":"FY","form":"10-K","filed":"2021-02-26","frame":"CY2019Q4I"},{"end":"2020-12-31","val":21464000,"accn":"0001303313-21-000009","fy":2020,"fp":"FY","form":"10-K","filed":"2021-02-26"},{"end":"2020-12-31","val":21464000,"accn":"0001303313-21-000048","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-06"},{"end":"2020-12-31","val":21464000,"accn":"0001303313-21-000063","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-05"},{"end":"2020-12-31","val":21464000,"accn":"0001303313-21-000072","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-04"},{"end":"2020-12-31","val":21464000,"accn":"0001303313-22-000006","fy":2021,"fp":"FY","form":"10-K","filed":"2022-02-24","frame":"CY2020Q4I"},{"end":"2021-03-31","val":22382000,"accn":"0001303313-21-000048","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-06","frame":"CY2021Q1I"},{"end":"2021-06-30","val":0,"accn":"0001303313-21-000063","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-05","frame":"CY2021Q2I"},{"end":"2021-09-30","val":0,"accn":"0001303313-21-000072","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-04","frame":"CY2021Q3I"},{"end":"2021-12-31","val":0,"accn":"0001303313-22-000006","fy":2021,"fp":"FY","form":"10-K","filed":"2022-02-24","frame":"CY2021Q4I"}]}},"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":"2011-01-01","end":"2011-12-31","val":23.93,"accn":"0001193125-13-112605","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"start":"2011-01-01","end":"2011-12-31","val":23.93,"accn":"0001193125-14-086648","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-06","frame":"CY2011"},{"start":"2012-01-01","end":"2012-06-30","val":16.92,"accn":"0001193125-12-347563","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"start":"2012-01-01","end":"2012-09-30","val":17.39,"accn":"0001193125-12-463326","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2012-01-01","end":"2012-12-31","val":17.52,"accn":"0001193125-13-112605","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"start":"2012-01-01","end":"2012-12-31","val":17.52,"accn":"0001193125-14-086648","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-06"},{"start":"2012-01-01","end":"2012-12-31","val":17.52,"accn":"0001303313-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11","frame":"CY2012"}]}},"TreasuryStockShares":{"label":"Treasury 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. 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