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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":"2012-12-31","val":0,"accn":"0001144204-15-018731","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0001144204-15-018731","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26"},{"end":"2013-12-31","val":0,"accn":"0001144204-15-031195","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15"},{"end":"2013-12-31","val":0,"accn":"0001144204-15-049617","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"end":"2013-12-31","val":0,"accn":"0001144204-15-065074","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13"},{"end":"2013-12-31","val":0,"accn":"0001144204-16-091341","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2013Q4I"},{"end":"2014-03-31","val":92000,"accn":"0001144204-15-031195","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15","frame":"CY2014Q1I"},{"end":"2014-12-31","val":92000,"accn":"0001144204-15-018731","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26"},{"end":"2014-12-31","val":92000,"accn":"0001144204-15-031195","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15"},{"end":"2014-12-31","val":92000,"accn":"0001144204-15-049617","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"end":"2014-12-31","val":92000,"accn":"0001144204-15-065074","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13"},{"end":"2014-12-31","val":92000,"accn":"0001144204-16-091341","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"end":"2014-12-31","val":92000,"accn":"0001144204-16-102232","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-16"},{"end":"2014-12-31","val":92000,"accn":"0001144204-16-119172","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-15"},{"end":"2014-12-31","val":92000,"accn":"0001144204-16-133815","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-14"},{"end":"2014-12-31","val":92000,"accn":"0001144204-17-019959","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-11","frame":"CY2014Q4I"},{"end":"2015-03-31","val":92000,"accn":"0001144204-15-031195","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15","frame":"CY2015Q1I"},{"end":"2015-06-30","val":92000,"accn":"0001144204-15-049617","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14","frame":"CY2015Q2I"},{"end":"2015-09-30","val":92000,"accn":"0001144204-15-065074","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13","frame":"CY2015Q3I"},{"end":"2015-12-31","val":99000,"accn":"0001144204-16-091341","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"end":"2015-12-31","val":99000,"accn":"0001144204-16-102232","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-16"},{"end":"2015-12-31","val":99000,"accn":"0001144204-16-119172","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-15"},{"end":"2015-12-31","val":99000,"accn":"0001144204-16-133815","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-14"},{"end":"2015-12-31","val":99000,"accn":"0001144204-17-019959","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-11"},{"end":"2015-12-31","val":99000,"accn":"0001144204-17-027543","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15","frame":"CY2015Q4I"},{"end":"2016-03-31","val":99000,"accn":"0001144204-16-102232","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-16","frame":"CY2016Q1I"},{"end":"2016-06-30","val":99000,"accn":"0001144204-16-119172","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-15","frame":"CY2016Q2I"},{"end":"2016-09-30","val":0,"accn":"0001144204-16-133815","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-14","frame":"CY2016Q3I"},{"end":"2016-12-31","val":0,"accn":"0001144204-17-019959","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-11"},{"end":"2016-12-31","val":0,"accn":"0001144204-17-027543","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15","frame":"CY2016Q4I"},{"end":"2017-03-31","val":0,"accn":"0001144204-17-027543","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15","frame":"CY2017Q1I"}]}},"AssetRetirementObligationAccretionExpense":{"label":"Asset Retirement Obligation, Accretion Expense","description":"Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.","units":{"USD":[{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0001144204-15-018731","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":0,"accn":"0001144204-15-031195","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0001144204-15-018731","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-26"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0001144204-15-049617","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0001144204-16-091341","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":0,"accn":"0001144204-15-031195","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":0,"accn":"0001144204-15-049617","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"start":"2015-01-01","end":"2015-12-31","val":7000,"accn":"0001144204-16-091341","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-30"},{"start":"2015-01-01","end":"2015-12-31","val":7000,"accn":"0001144204-16-102232","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-16"},{"start":"2015-01-01","end":"2015-12-31","val":7000,"accn":"0001144204-16-119172","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-15"},{"start":"2015-01-01","end":"2015-12-31","val":7000,"accn":"0001144204-16-133815","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-14"},{"start":"2015-01-01","end":"2015-12-31","val":7000,"accn":"0001144204-17-019959","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-11","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":0,"accn":"0001144204-16-102232","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-16","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":0,"accn":"0001144204-16-119172","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-15"},{"start":"2016-01-01","end":"2016-09-30","val":0,"accn":"0001144204-16-133815","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-14"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0001144204-17-019959","fy":2016,"fp":"FY","form":"10-K","filed":"2017-04-11"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0001144204-17-027543","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":0,"accn":"0001144204-17-027543","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15","frame":"CY2017Q1"}]}},"AssetRetirementObligationCashPaidToSettle":{"label":"Asset Retirement Obligation, Cash Paid to Settle","description":"Amount of cash paid during the period to settle an asset retirement obligation. 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positionOfAssets":{"label":"Gain 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Amount excludes temporary equity. Alternate caption for the concept is permanent 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