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liability.","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":47800,"accn":"0000950123-11-076907","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2010-04-01","end":"2010-06-30","val":23900,"accn":"0000950123-11-076907","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":71700,"accn":"0000950123-11-097589","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2010-07-01","end":"2010-09-30","val":23900,"accn":"0000950123-11-097589","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":95600,"accn":"0001193125-12-142901","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":37800,"accn":"0001193125-12-231037","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":75600,"accn":"0000950123-11-076907","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-01-01","end":"2011-06-30","val":75600,"accn":"0001193125-12-354740","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2011-04-01","end":"2011-06-30","val":37800,"accn":"0000950123-11-076907","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-12"},{"start":"2011-04-01","end":"2011-06-30","val":37800,"accn":"0001193125-12-354740","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":113500,"accn":"0000950123-11-097589","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-01-01","end":"2011-09-30","val":113500,"accn":"0001193125-12-462742","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2011-07-01","end":"2011-09-30","val":37900,"accn":"0000950123-11-097589","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"start":"2011-07-01","end":"2011-09-30","val":37900,"accn":"0001193125-12-462742","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":151300,"accn":"0001193125-12-142901","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"start":"2011-01-01","end":"2011-12-31","val":151300,"accn":"0001193125-13-135799","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":37200,"accn":"0001193125-12-231037","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-14"},{"start":"2012-01-01","end":"2012-03-31","val":37200,"accn":"0001193125-13-219436","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":74500,"accn":"0001193125-12-354740","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2012-01-01","end":"2012-06-30","val":74500,"accn":"0001432987-13-000002","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13"},{"start":"2012-04-01","end":"2012-06-30","val":37300,"accn":"0001193125-12-354740","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2012-04-01","end":"2012-06-30","val":37300,"accn":"0001432987-13-000002","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":111700,"accn":"0001193125-12-462742","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2012-01-01","end":"2012-09-30","val":111700,"accn":"0001564590-13-001224","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"start":"2012-07-01","end":"2012-09-30","val":37200,"accn":"0001193125-12-462742","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2012-07-01","end":"2012-09-30","val":37200,"accn":"0001564590-13-001224","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":149000,"accn":"0001193125-13-135799","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01"},{"start":"2012-01-01","end":"2012-12-31","val":149000,"accn":"0001564590-14-001193","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":41000,"accn":"0001193125-13-219436","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14"},{"start":"2013-01-01","end":"2013-03-31","val":41000,"accn":"0001564590-14-002218","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":82000,"accn":"0001432987-13-000002","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13"},{"start":"2013-01-01","end":"2013-06-30","val":82000,"accn":"0001564590-14-003768","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2013-04-01","end":"2013-06-30","val":41000,"accn":"0001432987-13-000002","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13"},{"start":"2013-04-01","end":"2013-06-30","val":41000,"accn":"0001564590-14-003768","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2013Q2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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":"2014-01-01","end":"2014-06-30","val":8700,"accn":"0001564590-15-007378","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"start":"2014-01-01","end":"2014-09-30","val":28600,"accn":"0001564590-15-011045","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-23"}]}},"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":"2013-01-01","end":"2013-12-31","val":252400,"accn":"0001564590-14-001193","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"start":"2013-01-01","end":"2013-12-31","val":252400,"accn":"0001564590-15-002226","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013"},{"start":"2014-01-01","end":"2014-06-30","val":8700,"accn":"0001564590-14-003768","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-01-01","end":"2014-06-30","val":8700,"accn":"0001564590-15-007378","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":8700,"accn":"0001564590-14-003768","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"start":"2014-04-01","end":"2014-06-30","val":8700,"accn":"0001564590-15-007378","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":28600,"accn":"0001564590-14-005772","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"start":"2014-01-01","end":"2014-09-30","val":28600,"accn":"0001564590-15-011045","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-23"},{"start":"2014-07-01","end":"2014-09-30","val":19900,"accn":"0001564590-14-005772","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"start":"2014-07-01","end":"2014-09-30","val":19900,"accn":"0001564590-15-011045","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-23","frame":"CY2014Q3"},{"start":"2014-01-01","end":"2014-12-31","val":-31800,"accn":"0001564590-16-016237","fy":2015,"fp":"FY","form":"10-K","filed":"2016-04-14","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-600,"accn":"0001564590-16-016237","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":"2011-06-30","val":0,"accn":"0001193125-12-354740","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2011-04-01","end":"2011-06-30","val":0,"accn":"0001193125-12-354740","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":0,"accn":"0001193125-12-462742","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2011-07-01","end":"2011-09-30","val":0,"accn":"0001193125-12-462742","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2011Q3"},{"start":"2012-01-01","end":"2012-03-31","val":0,"accn":"0001193125-13-219436","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0001193125-12-354740","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2012-04-01","end":"2012-06-30","val":0,"accn":"0001193125-12-354740","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":0,"accn":"0001193125-12-462742","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2012-07-01","end":"2012-09-30","val":0,"accn":"0001193125-12-462742","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2012Q3"},{"start":"2013-01-01","end":"2013-03-31","val":0,"accn":"0001193125-13-219436","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14","frame":"CY2013Q1"}]}},"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":"2010-01-01","end":"2010-12-31","val":832600,"accn":"0001193125-12-142901","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":251200,"accn":"0001193125-12-142901","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"start":"2011-01-01","end":"2011-12-31","val":251200,"accn":"0001193125-13-135799","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":-58300,"accn":"0001193125-13-135799","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01"},{"start":"2012-01-01","end":"2012-12-31","val":-58300,"accn":"0001564590-14-001193","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-353400,"accn":"0001564590-14-001193","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"start":"2013-01-01","end":"2013-12-31","val":-353400,"accn":"0001564590-15-002226","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":1132200,"accn":"0001564590-15-002226","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"start":"2014-01-01","end":"2014-12-31","val":1132200,"accn":"0001564590-16-016237","fy":2015,"fp":"FY","form":"10-K","filed":"2016-04-14","frame":"CY2014"}]}},"Assets":{"label":"Assets","description":"Sum 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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