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liability.","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":101100,"accn":"0000950123-11-077393","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"start":"2010-04-01","end":"2010-06-30","val":50500,"accn":"0000950123-11-077393","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":151700,"accn":"0000950123-11-097534","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":50600,"accn":"0000950123-11-097534","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":202200,"accn":"0001193125-12-143117","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":71000,"accn":"0001193125-12-231274","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":142000,"accn":"0000950123-11-077393","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"start":"2011-01-01","end":"2011-06-30","val":142000,"accn":"0001193125-12-354687","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2011-04-01","end":"2011-06-30","val":71000,"accn":"0000950123-11-077393","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"start":"2011-04-01","end":"2011-06-30","val":71000,"accn":"0001193125-12-354687","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":212900,"accn":"0000950123-11-097534","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":212900,"accn":"0001193125-12-462759","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2011-07-01","end":"2011-09-30","val":70900,"accn":"0000950123-11-097534","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":70900,"accn":"0001193125-12-462759","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":283900,"accn":"0001193125-12-143117","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"start":"2011-01-01","end":"2011-12-31","val":283900,"accn":"0001193125-13-135825","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":68000,"accn":"0001193125-12-231274","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":68000,"accn":"0001193125-13-219433","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":135800,"accn":"0001193125-12-354687","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2012-01-01","end":"2012-06-30","val":135800,"accn":"0001399542-13-000002","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":67800,"accn":"0001193125-12-354687","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2012-04-01","end":"2012-06-30","val":67800,"accn":"0001399542-13-000002","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":203800,"accn":"0001193125-12-462759","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2012-01-01","end":"2012-09-30","val":203800,"accn":"0001564590-13-001220","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"start":"2012-07-01","end":"2012-09-30","val":68000,"accn":"0001193125-12-462759","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2012-07-01","end":"2012-09-30","val":68000,"accn":"0001564590-13-001220","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":271700,"accn":"0001193125-13-135825","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01"},{"start":"2012-01-01","end":"2012-12-31","val":271700,"accn":"0001564590-14-001192","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":75100,"accn":"0001193125-13-219433","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14"},{"start":"2013-01-01","end":"2013-03-31","val":75100,"accn":"0001564590-14-002215","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":150100,"accn":"0001399542-13-000002","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13"},{"start":"2013-01-01","end":"2013-06-30","val":150100,"accn":"0001564590-14-003765","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":75000,"accn":"0001399542-13-000002","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13"},{"start":"2013-04-01","end":"2013-06-30","val":75000,"accn":"0001564590-14-003765","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":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Retirement Obligation, Cash Paid to Settle","description":"Amount of cash paid during the period to settle an asset retirement obligation. Amounts paid to settle an asset retirement obligation are generally included in the operating section of the Statement of Cash Flows.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":-21900,"accn":"0001193125-12-143117","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30","frame":"CY2010"},{"start":"2011-01-01","end":"2011-06-30","val":-14400,"accn":"0000950123-11-077393","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"start":"2011-01-01","end":"2011-06-30","val":-14400,"accn":"0001193125-12-354687","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2011-01-01","end":"2011-09-30","val":-14500,"accn":"0000950123-11-097534","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":-14500,"accn":"0001193125-12-462759","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2011-01-01","end":"2011-12-31","val":-14500,"accn":"0001193125-12-143117","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"start":"2011-01-01","end":"2011-12-31","val":14500,"accn":"0001193125-13-135825","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0001193125-12-354687","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0001193125-12-462759","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0001193125-13-135825","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012"},{"start":"2014-01-01","end":"2014-06-30","val":500,"accn":"0001564590-15-007375","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"start":"2014-01-01","end":"2014-09-30","val":30100,"accn":"0001564590-15-011036","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-23"},{"start":"2015-01-01","end":"2015-06-30","val":0,"accn":"0001564590-16-024406","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-15"},{"start":"2016-01-01","end":"2016-06-30","val":300,"accn":"0001564590-16-024406","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-15"}]}},"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":"2011-06-30","val":-14400,"accn":"0001193125-12-354687","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2011-04-01","end":"2011-06-30","val":-14400,"accn":"0001193125-12-354687","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":-14500,"accn":"0001193125-12-462759","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2011-07-01","end":"2011-09-30","val":-100,"accn":"0001193125-12-462759","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":-14500,"accn":"0001193125-13-135825","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011"},{"start":"2014-01-01","end":"2014-06-30","val":-500,"accn":"0001564590-14-003765","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":500,"accn":"0001564590-15-007375","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":-500,"accn":"0001564590-14-003765","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":500,"accn":"0001564590-15-007375","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":30100,"accn":"0001564590-14-005763","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"start":"2014-01-01","end":"2014-09-30","val":30100,"accn":"0001564590-15-011036","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-23"},{"start":"2014-07-01","end":"2014-09-30","val":29600,"accn":"0001564590-14-005763","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"start":"2014-07-01","end":"2014-09-30","val":29600,"accn":"0001564590-15-011036","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-23","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":30400,"accn":"0001564590-15-002236","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"start":"2014-01-01","end":"2014-12-31","val":30400,"accn":"0001564590-16-016238","fy":2015,"fp":"FY","form":"10-K","filed":"2016-04-14","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":500,"accn":"0001564590-16-016238","fy":2015,"fp":"FY","form":"10-K","filed":"2016-04-14","frame":"CY2015"}]}},"AssetRetirementObligationPeriodIncreaseDecrease":{"label":"Asset Retirement Obligation, Period Increase (Decrease)","description":"Amount of increase (decrease) in asset retirement obligations.","units":{"USD":[{"start":"2011-01-01","end":"2011-03-31","val":0,"accn":"0001193125-12-354687","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":0,"accn":"0001193125-12-354687","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2011-01-01","end":"2011-09-30","val":0,"accn":"0001193125-12-462759","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2011-07-01","end":"2011-09-30","val":0,"accn":"0001193125-12-462759","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2011Q3"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0001193125-12-354687","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2012-04-01","end":"2012-06-30","val":0,"accn":"0001193125-12-354687","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0001193125-12-462759","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2012-07-01","end":"2012-09-30","val":0,"accn":"0001193125-12-462759","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2012Q3"}]}},"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 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of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or 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This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial 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