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Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":3403000,"accn":"0001193125-13-076586","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2012Q4I"},{"end":"2013-12-31","val":3524000,"accn":"0001193125-14-070140","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-27","frame":"CY2013Q4I"},{"end":"2014-12-31","val":3614000,"accn":"0001193125-15-062973","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-26","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueInFourYears":{"label":"Capital Leases, Future Minimum Payments Due in Four Years","description":"Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":3528000,"accn":"0001193125-13-076586","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2012Q4I"},{"end":"2013-12-31","val":3503000,"accn":"0001193125-14-070140","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-27","frame":"CY2013Q4I"},{"end":"2014-12-31","val":3751000,"accn":"0001193125-15-062973","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-26","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueInThreeYears":{"label":"Capital Leases, Future Minimum Payments Due in Three Years","description":"Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":3994000,"accn":"0001193125-13-076586","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2012Q4I"},{"end":"2013-12-31","val":3756000,"accn":"0001193125-14-070140","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-27","frame":"CY2013Q4I"},{"end":"2014-12-31","val":4407000,"accn":"0001193125-15-062973","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-26","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueInTwoYears":{"label":"Capital Leases, Future Minimum Payments Due in Two Years","description":"Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":4276000,"accn":"0001193125-13-076586","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2012Q4I"},{"end":"2013-12-31","val":4437000,"accn":"0001193125-14-070140","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-27","frame":"CY2013Q4I"},{"end":"2014-12-31","val":4851000,"accn":"0001193125-15-062973","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-26","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsDueThereafter":{"label":"Capital Leases, Future Minimum Payments Due Thereafter","description":"Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. 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Equity Note, Spinoff Transaction","description":"The change in equity as a result of a spin-off transaction (a regular or reverse spin-off) which is based on the recorded amounts.","units":{"USD":[{"start":"2012-01-01","end":"2012-06-30","val":-193843000,"accn":"0001193125-13-327302","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09"},{"start":"2012-04-01","end":"2012-06-30","val":-193843000,"accn":"0001193125-12-452385","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-06"},{"start":"2012-04-01","end":"2012-06-30","val":-193843000,"accn":"0001193125-13-327302","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09"},{"start":"2012-04-01","end":"2012-06-30","val":-193843000,"accn":"0001193125-13-425435","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-04","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":-193843000,"accn":"0001193125-13-425435","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-04"},{"start":"2012-01-01","end":"2012-12-31","val":-193843000,"accn":"0001193125-13-076586","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26"},{"start":"2012-01-01","end":"2012-12-31","val":-193843000,"accn":"0001193125-14-070140","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-27"},{"start":"2012-01-01","end":"2012-12-31","val":-193843000,"accn":"0001193125-15-062973","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-26","frame":"CY2012"}]}},"StockIssuedDuringPeriodSharesStockOptionsExercised":{"label":"Share-based 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