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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":50304,"accn":"0001104659-13-025420","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":50304,"accn":"0001104659-12-076427","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2011-01-01","end":"2011-12-31","val":50304,"accn":"0001104659-12-056847","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-10"},{"start":"2012-01-01","end":"2012-12-31","val":93725,"accn":"0001104659-13-025420","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":75355,"accn":"0001104659-13-041764","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":75355,"accn":"0001104659-13-062670","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"start":"2013-01-01","end":"2013-09-30","val":75355,"accn":"0001104659-13-083479","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":127066,"accn":"0001104659-14-037973","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013"},{"start":"2013-01-01","end":"2013-12-31","val":127066,"accn":"0001104659-14-023315","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27"},{"start":"2014-01-01","end":"2014-03-31","val":37996,"accn":"0001104659-14-037973","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1"}]}},"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":429827,"accn":"0001104659-12-076427","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2010Q4I"},{"end":"2010-12-31","val":429827,"accn":"0001104659-12-056847","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-10"},{"end":"2010-12-31","val":429827,"accn":"0001104659-12-021273","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-27"},{"end":"2010-12-31","val":429827,"accn":"0001104659-11-063107","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":429827,"accn":"0001104659-11-046190","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-11"},{"end":"2011-06-30","val":434804,"accn":"0001104659-11-046190","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-11","frame":"CY2011Q2I"},{"end":"2011-09-30","val":438674,"accn":"0001104659-11-063107","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":394823,"accn":"0001104659-13-025420","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2011-12-31","val":394823,"accn":"0001104659-12-076427","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"end":"2011-12-31","val":394823,"accn":"0001104659-12-056847","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-10"},{"end":"2011-12-31","val":394823,"accn":"0001104659-12-036270","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-11"},{"end":"2011-12-31","val":394823,"accn":"0001104659-12-021273","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-27"},{"end":"2012-03-31","val":435362,"accn":"0001104659-12-036270","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-11","frame":"CY2012Q1I"},{"end":"2012-06-30","val":440082,"accn":"0001104659-12-056847","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-10","frame":"CY2012Q2I"},{"end":"2012-09-30","val":444885,"accn":"0001104659-12-076427","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2012Q3I"},{"end":"2012-12-31","val":207578,"accn":"0001104659-14-023315","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27","frame":"CY2012Q4I"},{"end":"2012-12-31","val":207578,"accn":"0001104659-13-083479","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"end":"2012-12-31","val":207578,"accn":"0001104659-13-062670","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":207578,"accn":"0001104659-13-041764","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15"},{"end":"2012-12-31","val":207578,"accn":"0001104659-13-025420","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2013-03-31","val":181641,"accn":"0001104659-13-041764","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15","frame":"CY2013Q1I"},{"end":"2013-06-30","val":138342,"accn":"0001104659-13-062670","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":139524,"accn":"0001104659-13-083479","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":140725,"accn":"0001104659-14-037973","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q4I"},{"end":"2013-12-31","val":140725,"accn":"0001104659-14-023315","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27"},{"end":"2014-03-31","val":84894,"accn":"0001104659-14-037973","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"}]}},"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 events.","units":{"USD":[{"end":"2010-12-31","val":2815422,"accn":"0001104659-12-021273","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-27","frame":"CY2010Q4I"},{"end":"2010-12-31","val":2815422,"accn":"0001104659-11-063107","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":2815422,"accn":"0001104659-11-046190","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-11"},{"end":"2011-06-30","val":2508107,"accn":"0001104659-11-046190","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-11","frame":"CY2011Q2I"},{"end":"2011-09-30","val":2219257,"accn":"0001104659-11-063107","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":1912917,"accn":"0001104659-13-025420","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2011-12-31","val":1912917,"accn":"0001104659-12-076427","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"end":"2011-12-31","val":1912917,"accn":"0001104659-12-056847","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-10"},{"end":"2011-12-31","val":1912917,"accn":"0001104659-12-036270","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-11"},{"end":"2011-12-31","val":1912917,"accn":"0001104659-12-021273","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-27"},{"end":"2012-03-31","val":1710749,"accn":"0001104659-12-036270","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-11","frame":"CY2012Q1I"},{"end":"2012-06-30","val":1477279,"accn":"0001104659-12-056847","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-10","frame":"CY2012Q2I"},{"end":"2012-09-30","val":1294102,"accn":"0001104659-12-076427","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2012Q3I"},{"end":"2012-12-31","val":844426,"accn":"0001104659-14-023315","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27","frame":"CY2012Q4I"},{"end":"2012-12-31","val":844426,"accn":"0001104659-13-083479","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"end":"2012-12-31","val":844426,"accn":"0001104659-13-062670","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":844426,"accn":"0001104659-13-041764","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15"},{"end":"2012-12-31","val":844426,"accn":"0001104659-13-025420","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2013-03-31","val":415005,"accn":"0001104659-13-041764","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15","frame":"CY2013Q1I"},{"end":"2013-06-30","val":295869,"accn":"0001104659-13-062670","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":252440,"accn":"0001104659-13-083479","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":233853,"accn":"0001104659-14-037973","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q4I"},{"end":"2013-12-31","val":233853,"accn":"0001104659-14-023315","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27"},{"end":"2014-03-31","val":218006,"accn":"0001104659-14-037973","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"}]}},"AssetsCurrent":{"label":"Assets, Current","description":"Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.","units":{"USD":[{"end":"2010-12-31","val":816820,"accn":"0001104659-12-021273","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-27","frame":"CY2010Q4I"},{"end":"2010-12-31","val":816820,"accn":"0001104659-11-063107","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10"},{"end":"2010-12-31","val":816820,"accn":"0001104659-11-046190","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-11"},{"end":"2011-06-30","val":915987,"accn":"0001104659-11-046190","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-11","frame":"CY2011Q2I"},{"end":"2011-09-30","val":819619,"accn":"0001104659-11-063107","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-10","frame":"CY2011Q3I"},{"end":"2011-12-31","val":660626,"accn":"0001104659-13-025420","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2011-12-31","val":660626,"accn":"0001104659-12-076427","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"end":"2011-12-31","val":660626,"accn":"0001104659-12-056847","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-10"},{"end":"2011-12-31","val":660626,"accn":"0001104659-12-036270","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-11"},{"end":"2011-12-31","val":660626,"accn":"0001104659-12-021273","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-27"},{"end":"2012-03-31","val":543865,"accn":"0001104659-12-036270","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-11","frame":"CY2012Q1I"},{"end":"2012-06-30","val":378191,"accn":"0001104659-12-056847","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-10","frame":"CY2012Q2I"},{"end":"2012-09-30","val":256344,"accn":"0001104659-12-076427","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2012Q3I"},{"end":"2012-12-31","val":283816,"accn":"0001104659-14-023315","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27","frame":"CY2012Q4I"},{"end":"2012-12-31","val":283816,"accn":"0001104659-13-083479","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"end":"2012-12-31","val":283816,"accn":"0001104659-13-062670","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12"},{"end":"2012-12-31","val":283816,"accn":"0001104659-13-041764","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15"},{"end":"2012-12-31","val":283816,"accn":"0001104659-13-025420","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2013-03-31","val":174755,"accn":"0001104659-13-041764","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15","frame":"CY2013Q1I"},{"end":"2013-06-30","val":172279,"accn":"0001104659-13-062670","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-12","frame":"CY2013Q2I"},{"end":"2013-09-30","val":167279,"accn":"0001104659-13-083479","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":167279,"accn":"0001104659-14-037973","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2013Q4I"},{"end":"2013-12-31","val":167279,"accn":"0001104659-14-023315","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27"},{"end":"2014-03-31","val":167279,"accn":"0001104659-14-037973","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-13","frame":"CY2014Q1I"}]}},"CapitalizedCostsProvedProperties":{"label":"Capitalized Costs, Proved Properties","description":"Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.","units":{"USD":[{"end":"2010-12-31","val":33596816,"accn":"0001104659-13-025420","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2010Q4I"},{"end":"2011-12-31","val":33589907,"accn":"0001104659-14-023315","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27","frame":"CY2011Q4I"},{"end":"2011-12-31","val":33589907,"accn":"0001104659-13-025420","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2012-12-31","val":33601539,"accn":"0001104659-14-023315","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27","frame":"CY2012Q4I"},{"end":"2012-12-31","val":33601539,"accn":"0001104659-13-025420","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2013-12-31","val":33516315,"accn":"0001104659-14-023315","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-27","frame":"CY2013Q4I"}]}},"CashAndCashEquivalentsAtCarryingValue":{"label":"Cash and Cash Equivalents, at Carrying Value","description":"Amount of currency on hand as well as demand deposits with banks or financial institutions. 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