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Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":1396000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":1870000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28"},{"start":"2012-01-01","end":"2012-12-31","val":1870000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":1514000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"start":"2013-01-01","end":"2013-12-31","val":1514000,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":1595000,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27"},{"start":"2014-01-01","end":"2014-12-31","val":1595000,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":1658000,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29"},{"start":"2015-01-01","end":"2015-12-31","val":1658000,"accn":"0001035216-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":1908000,"accn":"0001035216-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2016"}]}},"AssetRetirementObligationLiabilitiesIncurred":{"label":"Asset Retirement Obligation, Liabilities Incurred","description":"Amount of asset retirement obligations incurred during the period.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":460000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":989000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28"},{"start":"2012-01-01","end":"2012-12-31","val":989000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":743000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"start":"2013-01-01","end":"2013-12-31","val":743000,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":664000,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27"},{"start":"2014-01-01","end":"2014-12-31","val":664000,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":621000,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29"},{"start":"2015-01-01","end":"2015-12-31","val":621000,"accn":"0001035216-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":1098000,"accn":"0001035216-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2016"}]}},"AssetRetirementObligationLiabilitiesSettled":{"label":"Asset Retirement Obligation, Liabilities Settled","description":"Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":872000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":1603000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28"},{"start":"2012-01-01","end":"2012-12-31","val":1603000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":1630000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"start":"2013-01-01","end":"2013-12-31","val":1630000,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":1461000,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27"},{"start":"2014-01-01","end":"2014-12-31","val":1461000,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":1110000,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29"},{"start":"2015-01-01","end":"2015-12-31","val":1110000,"accn":"0001035216-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":1551000,"accn":"0001035216-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2016"}]}},"AssetRetirementObligationRevisionOfEstimate":{"label":"Asset Retirement Obligation, Revision of Estimate","description":"Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":479000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":8248000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28"},{"start":"2012-01-01","end":"2012-12-31","val":8248000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":1659000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"start":"2013-01-01","end":"2013-12-31","val":1659000,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":14074000,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29"},{"start":"2015-01-01","end":"2015-12-31","val":14074000,"accn":"0001035216-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0001035216-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2016"}]}},"AssetRetirementObligationsNoncurrent":{"label":"Asset Retirement Obligations, Noncurrent","description":"Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.","units":{"USD":[{"end":"2010-12-31","val":27925000,"accn":"0001140361-11-040281","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"end":"2010-12-31","val":27925000,"accn":"0001445305-11-003311","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"end":"2010-12-31","val":27925000,"accn":"0001445305-12-000506","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2010Q4I"},{"end":"2011-06-30","val":28285000,"accn":"0001140361-11-040281","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2011Q2I"},{"end":"2011-09-30","val":28553000,"accn":"0001445305-11-003311","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08","frame":"CY2011Q3I"},{"end":"2011-12-31","val":29388000,"accn":"0001445305-12-000506","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28"},{"end":"2011-12-31","val":29388000,"accn":"0001445305-12-001515","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-07"},{"end":"2011-12-31","val":29388000,"accn":"0001035216-12-000002","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07"},{"end":"2011-12-31","val":29388000,"accn":"0001035216-12-000007","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":29388000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2011Q4I"},{"end":"2012-03-31","val":29447000,"accn":"0001445305-12-001515","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-07","frame":"CY2012Q1I"},{"end":"2012-06-30","val":29888000,"accn":"0001035216-12-000002","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07","frame":"CY2012Q2I"},{"end":"2012-09-30","val":30278000,"accn":"0001035216-12-000007","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":38892000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28"},{"end":"2012-12-31","val":38892000,"accn":"0001035216-13-000006","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-03"},{"end":"2012-12-31","val":38892000,"accn":"0001035216-13-000009","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08"},{"end":"2012-12-31","val":38892000,"accn":"0001035216-13-000014","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"end":"2012-12-31","val":38892000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012Q4I"},{"end":"2013-03-31","val":39258000,"accn":"0001035216-13-000006","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-03","frame":"CY2013Q1I"},{"end":"2013-06-30","val":39566000,"accn":"0001035216-13-000009","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08","frame":"CY2013Q2I"},{"end":"2013-09-30","val":39645000,"accn":"0001035216-13-000014","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":41178000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"end":"2013-12-31","val":41178000,"accn":"0001035216-14-000008","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09"},{"end":"2013-12-31","val":41178000,"accn":"0001035216-14-000013","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"end":"2013-12-31","val":41178000,"accn":"0001035216-14-000019","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-07"},{"end":"2013-12-31","val":41178000,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2013Q4I"},{"end":"2014-03-31","val":41412000,"accn":"0001035216-14-000008","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09","frame":"CY2014Q1I"},{"end":"2014-06-30","val":41708000,"accn":"0001035216-14-000013","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06","frame":"CY2014Q2I"},{"end":"2014-09-30","val":41842000,"accn":"0001035216-14-000019","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-07","frame":"CY2014Q3I"},{"end":"2014-12-31","val":41976000,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27"},{"end":"2014-12-31","val":41976000,"accn":"0001035216-15-000006","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08"},{"end":"2014-12-31","val":41976000,"accn":"0001035216-15-000009","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07"},{"end":"2014-12-31","val":41976000,"accn":"0001035216-15-000012","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05"},{"end":"2014-12-31","val":41976000,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29","frame":"CY2014Q4I"},{"end":"2015-03-31","val":42069000,"accn":"0001035216-15-000006","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08","frame":"CY2015Q1I"},{"end":"2015-06-30","val":42292000,"accn":"0001035216-15-000009","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07","frame":"CY2015Q2I"},{"end":"2015-09-30","val":42516000,"accn":"0001035216-15-000012","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"},{"end":"2015-12-31","val":57219000,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-2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Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.","units":{"USD":[{"end":"2011-12-31","val":472000000,"accn":"0001035216-12-000002","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07"},{"end":"2011-12-31","val":472000000,"accn":"0001035216-12-000007","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q4I"},{"end":"2012-06-30","val":467800000,"accn":"0001035216-12-000002","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07","frame":"CY2012Q2I"},{"end":"2012-09-30","val":518500000,"accn":"0001035216-12-000007","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":502000000,"accn":"0001035216-13-000006","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-03"},{"end":"2012-12-31","val":502000000,"accn":"0001035216-13-000009","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08"},{"end":"2012-12-31","val":502000000,"accn":"0001035216-13-000014","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2012Q4I"},{"end":"2013-03-31","val":492900000,"accn":"0001035216-13-000006","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-03","frame":"CY2013Q1I"},{"end":"2013-06-30","val":472200000,"accn":"0001035216-13-000009","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08","frame":"CY2013Q2I"},{"end":"2013-09-30","val":446200000,"accn":"0001035216-13-000014","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":486500000,"accn":"0001035216-14-000008","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09"},{"end":"2013-12-31","val":486500000,"accn":"0001035216-14-000013","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"end":"2013-12-31","val":486500000,"accn":"0001035216-14-000019","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-07","frame":"CY2013Q4I"},{"end":"2014-03-31","val":531300000,"accn":"0001035216-14-000008","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09","frame":"CY2014Q1I"},{"end":"2014-06-30","val":603000000,"accn":"0001035216-14-000013","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06","frame":"CY2014Q2I"},{"end":"2014-09-30","val":572200000,"accn":"0001035216-14-000019","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-07","frame":"CY2014Q3I"},{"end":"2014-12-31","val":587300000,"accn":"0001035216-15-000006","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08"},{"end":"2014-12-31","val":587300000,"accn":"0001035216-15-000009","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07"},{"end":"2014-12-31","val":587300000,"accn":"0001035216-15-000012","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2014Q4I"},{"end":"2015-03-31","val":595800000,"accn":"0001035216-15-000006","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08","frame":"CY2015Q1I"},{"end":"2015-06-30","val":579100000,"accn":"0001035216-15-000009","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07","frame":"CY2015Q2I"},{"end":"2015-09-30","val":662700000,"accn":"0001035216-15-000012","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"},{"end":"2015-12-31","val":657400000,"accn":"0001035216-16-000020","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-06"},{"end":"2015-12-31","val":657400000,"accn":"0001035216-16-000023","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-05"},{"end":"2015-12-31","val":657400000,"accn":"0001035216-16-000026","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04","frame":"CY2015Q4I"},{"end":"2016-03-31","val":723200000,"accn":"0001035216-16-000020","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-06","frame":"CY2016Q1I"},{"end":"2016-06-30","val":733000000,"accn":"0001035216-16-000023","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-05","frame":"CY2016Q2I"},{"end":"2016-09-30","val":699700000,"accn":"0001035216-16-000026","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04","frame":"CY2016Q3I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":{"label":"Long-Term Debt, Maturity, Year One","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 next 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":25000000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":21000000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"},{"end":"2014-12-31","val":35909000,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2014Q4I"},{"end":"2015-12-31","val":27909000,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":215909000,"accn":"0001035216-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2016Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive":{"label":"Long-Term Debt, Maturity, Year Five","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 fifth 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":15909000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":38909000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"},{"end":"2014-12-31","val":18909000,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2014Q4I"},{"end":"2015-12-31","val":17909000,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":27909000,"accn":"0001035216-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2016Q4I"}]}},"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":27909000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":15909000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"},{"end":"2014-12-31","val":38909000,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2014Q4I"},{"end":"2015-12-31","val":18909000,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":17909000,"accn":"0001035216-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2016Q4I"}]}},"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. 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":10909000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":27909000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"},{"end":"2014-12-31","val":74909000,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2014Q4I"},{"end":"2015-12-31","val":38909000,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":18909000,"accn":"0001035216-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2016Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo":{"label":"Long-Term Debt, Maturity, Year Two","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 second 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":21000000,"accn":"0001035216-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":10909000,"accn":"0001035216-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013Q4I"},{"end":"2014-12-31","val":27909000,"accn":"0001035216-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-27","frame":"CY2014Q4I"},{"end":"2015-12-31","val":154909000,"accn":"0001035216-16-000015","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":38909000,"accn":"0001035216-17-000003","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-27","frame":"CY2016Q4I"}]}},"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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