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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":22100000,"accn":"0001299033-13-000017","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-14","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0001299033-14-000012","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":23855000,"accn":"0001299033-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-13","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0001299033-16-000031","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2015Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour":{"label":"Long-Term Debt, Maturity, Year Four","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":0,"accn":"0001299033-13-000017","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-14","frame":"CY2012Q4I"},{"end":"2013-12-31","val":22100000,"accn":"0001299033-14-000012","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0001299033-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-13","frame":"CY2014Q4I"},{"end":"2015-12-31","val":23855000,"accn":"0001299033-16-000031","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2015Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree":{"label":"Long-Term Debt, Maturity, Year Three","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":46160000,"accn":"0001299033-13-000017","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-14","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0001299033-14-000012","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0001299033-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-13","frame":"CY2014Q4I"},{"end":"2015-12-31","val":22100000,"accn":"0001299033-16-000031","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2015Q4I"}]}},"LongTermDebtNoncurrent":{"label":"Long-term Debt, Excluding Current Maturities","description":"Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. 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