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liability.","units":{"USD":[{"start":"2008-01-01","end":"2008-12-31","val":761000,"accn":"0000950123-11-018697","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25"},{"start":"2008-01-01","end":"2008-12-31","val":759000,"accn":"0000950123-11-051478","fy":2010,"fp":"FY","form":"8-K","filed":"2011-05-18","frame":"CY2008"},{"start":"2009-01-01","end":"2009-06-30","val":579000,"accn":"0000950123-10-073797","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06"},{"start":"2009-04-01","end":"2009-06-30","val":301000,"accn":"0000950123-10-073797","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06","frame":"CY2009Q2"},{"start":"2009-01-01","end":"2009-09-30","val":799000,"accn":"0000950123-10-100561","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-04"},{"start":"2009-07-01","end":"2009-09-30","val":220000,"accn":"0000950123-10-100561","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-04","frame":"CY2009Q3"},{"start":"2009-01-01","end":"2009-12-31","val":917000,"accn":"0000950123-11-018697","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25"},{"start":"2009-01-01","end":"2009-12-31","val":909000,"accn":"0000950123-11-051478","fy":2010,"fp":"FY","form":"8-K","filed":"2011-05-18"},{"start":"2009-01-01","end":"2009-12-31","val":909000,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-03-31","val":341000,"accn":"0000950123-11-046179","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-06","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-06-30","val":772000,"accn":"0000950123-10-073797","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06"},{"start":"2010-01-01","end":"2010-06-30","val":657000,"accn":"0001193125-11-212154","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05"},{"start":"2010-04-01","end":"2010-06-30","val":372000,"accn":"0000950123-10-073797","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06"},{"start":"2010-04-01","end":"2010-06-30","val":316000,"accn":"0001193125-11-212154","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":1177000,"accn":"0000950123-10-100561","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-04"},{"start":"2010-01-01","end":"2010-09-30","val":1006000,"accn":"0001193125-11-295219","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-03"},{"start":"2010-07-01","end":"2010-09-30","val":405000,"accn":"0000950123-10-100561","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-04"},{"start":"2010-07-01","end":"2010-09-30","val":349000,"accn":"0001193125-11-295219","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-03","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":1503000,"accn":"0000950123-11-018697","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25"},{"start":"2010-01-01","end":"2010-12-31","val":1482000,"accn":"0000950123-11-051478","fy":2010,"fp":"FY","form":"8-K","filed":"2011-05-18"},{"start":"2010-01-01","end":"2010-12-31","val":1482000,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"start":"2010-01-01","end":"2010-12-31","val":1079000,"accn":"0001358071-13-000006","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":704000,"accn":"0000950123-11-046179","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-06"},{"start":"2011-01-01","end":"2011-03-31","val":704000,"accn":"0001193125-12-208532","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-03","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":1419000,"accn":"0001193125-11-212154","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05"},{"start":"2011-01-01","end":"2011-06-30","val":1419000,"accn":"0001193125-12-342307","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"start":"2011-04-01","end":"2011-06-30","val":715000,"accn":"0001193125-11-212154","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05"},{"start":"2011-04-01","end":"2011-06-30","val":715000,"accn":"0001193125-12-342307","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":2170000,"accn":"0001193125-11-295219","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-03"},{"start":"2011-01-01","end":"2011-09-30","val":2170000,"accn":"0001358071-12-000011","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-07-01","end":"2011-09-30","val":751000,"accn":"0001193125-11-295219","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-03"},{"start":"2011-07-01","end":"2011-09-30","val":751000,"accn":"0001358071-12-000011","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-01-01","end":"2011-12-31","val":2965000,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"start":"2011-01-01","end":"2011-12-31","val":2444000,"accn":"0001358071-13-000006","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},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Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. 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Expense","description":"\"Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or \"\"G&G\"\" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test 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8-000008","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21"},{"start":"2016-01-01","end":"2016-12-31","val":61000000,"accn":"0001358071-19-000003","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-20","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":2000000,"accn":"0001358071-17-000010","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-04"},{"start":"2017-01-01","end":"2017-03-31","val":2000000,"accn":"0001358071-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":30000000,"accn":"0001358071-17-000013","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-03"},{"start":"2017-01-01","end":"2017-06-30","val":30000000,"accn":"0001358071-18-000014","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-02"},{"start":"2017-01-01","end":"2017-09-30","val":34000000,"accn":"0001358071-17-000017","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-01"},{"start":"2017-01-01","end":"2017-09-30","val":34000000,"accn":"0001358071-18-000018","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-31"},{"start":"2017-01-01","end":"2017-12-31","val":44000000,"accn":"0001358071-18-000008","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21"},{"start":"2017-01-01","end":"2017-12-31","val":44000000,"accn":"0001358071-19-000003","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-20"},{"start":"2017-01-01","end":"2017-12-31","val":44000000,"accn":"0001358071-20-000011","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-19","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":6000000,"accn":"0001358071-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02"},{"start":"2018-01-01","end":"2018-03-31","val":6000000,"accn":"0001358071-19-000006","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-01","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":11000000,"accn":"0001358071-18-000014","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-02"},{"start":"2018-01-01","end":"2018-06-30","val":11000000,"accn":"0001358071-19-000011","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-01"},{"start":"2018-01-01","end":"2018-09-30","val":53000000,"accn":"0001358071-18-000018","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-31"},{"start":"2018-01-01","end":"2018-09-30","val":53000000,"accn":"0001358071-19-000023","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-30"},{"start":"2018-01-01","end":"2018-12-31","val":90000000,"accn":"0001358071-19-000003","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-20"},{"start":"2018-01-01","end":"2018-12-31","val":90000000,"accn":"0001358071-20-000011","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-19","frame":"CY2018"},{"start":"2019-01-01","end":"2019-03-31","val":15000000,"accn":"0001358071-19-000006","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-01"},{"start":"2019-01-01","end":"2019-03-31","val":15000000,"accn":"0001358071-20-000032","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-01","frame":"CY2019Q1"},{"start":"2019-01-01","end":"2019-06-30","val":41000000,"accn":"0001358071-19-000011","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-01"},{"start":"2019-01-01","end":"2019-06-30","val":41000000,"accn":"0001358071-20-000045","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-07-31"},{"start":"2019-01-01","end":"2019-09-30","val":82000000,"accn":"0001358071-19-000023","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-30"},{"start":"2019-01-01","end":"2019-09-30","val":82000000,"accn":"0001358071-20-000059","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-10-27"},{"start":"2019-01-01","end":"2019-12-31","val":117000000,"accn":"0001358071-20-000011","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-19","frame":"CY2019"},{"start":"2020-01-01","end":"2020-03-31","val":19000000,"accn":"0001358071-20-000032","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-01","frame":"CY2020Q1"},{"start":"2020-01-01","end":"2020-06-30","val":39000000,"accn":"0001358071-20-000045","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-07-31"},{"start":"2020-01-01","end":"2020-09-30","val":49000000,"accn":"0001358071-20-000059","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-10-27"}]}},"PaymentsToAcquireProductiveAssets":{"label":"Payments 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other.","units":{"USD":[{"end":"2013-12-31","val":39200000,"accn":"0001358071-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-26","frame":"CY2013Q4I"},{"end":"2014-12-31","val":52500000,"accn":"0001358071-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-26"},{"end":"2014-12-31","val":52500000,"accn":"0001358071-16-000026","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25","frame":"CY2014Q4I"},{"end":"2015-12-31","val":54400000,"accn":"0001358071-16-000026","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25"},{"end":"2015-12-31","val":54400000,"accn":"0001358071-17-000005","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22","frame":"CY2015Q4I"},{"end":"2016-12-31","val":73700000,"accn":"0001358071-17-000005","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"end":"2016-12-31","val":74000000,"accn":"0001358071-18-000008","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2016Q4I"},{"end":"2017-12-31","val":90000000,"accn":"0001358071-18-000008","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21"},{"end":"2017-12-31","val":90000000,"accn":"0001358071-19-000003","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-20","frame":"CY2017Q4I"},{"end":"2018-12-31","val":109000000,"accn":"0001358071-19-000003","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-20"},{"end":"2018-12-31","val":109000000,"accn":"0001358071-20-000011","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-19","frame":"CY2018Q4I"},{"end":"2019-12-31","val":126000000,"accn":"0001358071-20-000011","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-19","frame":"CY2019Q4I"}]}},"PropertyPlantAndEquipmentOtherNet":{"label":"Property, Plant and Equipment, Other, Net","description":"Amount after depreciation of long-lived, physical assets used to produce goods and services and not intended for resale, classified as other.","units":{"USD":[{"end":"2013-12-31","val":114783000,"accn":"0001358071-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-26","frame":"CY2013Q4I"},{"end":"2014-12-31","val":129136000,"accn":"0001358071-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-26"},{"end":"2014-12-31","val":129136000,"accn":"0001358071-16-000026","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25","frame":"CY2014Q4I"},{"end":"2015-12-31","val":178450000,"accn":"0001358071-16-000026","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25"},{"end":"2015-12-31","val":178450000,"accn":"0001358071-16-000029","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-05"},{"end":"2015-12-31","val":178450000,"accn":"0001358071-16-000037","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-03"},{"end":"2015-12-31","val":178450000,"accn":"0001358071-16-000041","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09"},{"end":"2015-12-31","val":178450000,"accn":"0001358071-17-000005","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22","frame":"CY2015Q4I"},{"end":"2016-03-31","val":182473000,"accn":"0001358071-16-000029","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-05","frame":"CY2016Q1I"},{"end":"2016-06-30","val":183966000,"accn":"0001358071-16-000037","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-03","frame":"CY2016Q2I"},{"end":"2016-09-30","val":181267000,"accn":"0001358071-16-000041","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09","frame":"CY2016Q3I"},{"end":"2016-12-31","val":215998000,"accn":"0001358071-17-000005","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"end":"2016-12-31","val":216000000,"accn":"0001358071-17-000010","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-04"},{"end":"2016-12-31","val":216000000,"accn":"0001358071-17-000013","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-03"},{"end":"2016-12-31","val":216000000,"accn":"0001358071-17-000017","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-01"},{"end":"2016-12-31","val":216000000,"accn":"0001358071-18-000008","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2016Q4I"},{"end":"2017-03-31","val":209000000,"accn":"0001358071-17-000010","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-04","frame":"CY2017Q1I"},{"end":"2017-06-30","val":234000000,"accn":"0001358071-17-000013","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-03","frame":"CY2017Q2I"},{"end":"2017-09-30","val":232000000,"accn":"0001358071-17-000017","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-01","frame":"CY2017Q3I"},{"end":"2017-12-31","val":234000000,"accn":"0001358071-18-000008","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21"},{"end":"2017-12-31","val":234000000,"accn":"0001358071-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02"},{"end":"2017-12-31","val":234000000,"accn":"0001358071-18-000014","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-02"},{"end":"2017-12-31","val":234000000,"accn":"0001358071-18-000018","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-31"},{"end":"2017-12-31","val":234000000,"accn":"0001358071-19-000003","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-20","frame":"CY2017Q4I"},{"end":"2018-03-31","val":246000000,"accn":"0001358071-18-000011","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-02","frame":"CY2018Q1I"},{"end":"2018-06-30","val":235000000,"accn":"0001358071-18-000014","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-02","frame":"CY2018Q2I"},{"end":"2018-09-30","val":277000000,"accn":"0001358071-18-000018","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-31","frame":"CY2018Q3I"},{"end":"2018-12-31","val":308000000,"accn":"0001358071-19-000003","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-20"},{"end":"2018-12-31","val":308000000,"accn":"0001358071-19-000006","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-01"},{"end":"2018-12-31","val":308000000,"accn":"0001358071-19-000011","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-01"},{"end":"2018-12-31","val":308000000,"accn":"0001358071-19-000023","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-30"},{"end":"2018-12-31","val":308000000,"accn":"0001358071-20-000011","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-19","frame":"CY2018Q4I"},{"end":"2019-03-31","val":350000000,"accn":"0001358071-19-000006","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-01","frame":"CY2019Q1I"},{"end":"2019-06-30","val":374000000,"accn":"0001358071-19-000011","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-01","frame":"CY2019Q2I"},{"end":"2019-09-30","val":408000000,"accn":"0001358071-19-000023","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-30","frame":"CY2019Q3I"},{"end":"2019-12-31","val":437000000,"accn":"0001358071-20-000011","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-19"},{"end":"2019-12-31","val":437000000,"accn":"0001358071-20-000032","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-01"},{"end":"2019-12-31","val":437000000,"accn":"0001358071-20-000045","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-07-31"},{"end":"2019-12-31","val":437000000,"accn":"0001358071-20-000059","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-10-27","frame":"CY2019Q4I"},{"end":"2020-03-31","val":449000000,"accn":"0001358071-20-000032","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-01","frame":"CY2020Q1I"},{"end":"2020-06-30","val":448000000,"accn":"0001358071-20-000045","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-07-31","frame":"CY2020Q2I"},{"end":"2020-09-30","val":456000000,"accn":"0001358071-20-000059","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-10-27","frame":"CY2020Q3I"}]}},"PropertyPlantAndEquipmentUsefulLifeMaximum":{"label":"Property, Plant and Equipment, Useful Life, Maximum (Deprecated 2012-01-31)","description":"The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.","units":{"years":[{"start":"2011-01-01","end":"2011-12-31","val":31,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011"}]}},"PropertyPlantAndEquipmentUsefulLifeMinimum":{"label":"Property, Plant and Equipment, Useful Life, Minimum (Deprecated 2012-01-31)","description":"The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.","units":{"years":[{"start":"2011-01-01","end":"2011-12-31","val":2,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011"}]}},"ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions":{"label":"Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions","description":"Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.","units":{"pure":[{"start":"2009-01-01","end":"2009-12-31","val":65942,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":59638,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":86488,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011"}]}},"ProvedDevelopedAndUndevelopedReservesNet":{"label":"Proved Developed and Undeveloped Reserves, Net","description":"The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.","units":{"pure":[{"end":"2008-12-31","val":137275,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2008Q4I"},{"end":"2009-12-31","val":211503,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009Q4I"},{"end":"2010-12-31","val":323452,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010Q4I"},{"end":"2011-12-31","val":386521,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011Q4I"}]}},"ProvedDevelopedAndUndevelopedReservesProduction":{"label":"Proved Developed and Undeveloped Reserves, Production","description":"Production of proved reserves.","units":{"pure":[{"start":"2009-01-01","end":"2009-12-31","val":-10931,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":-15564,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-23644,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011"}]}},"ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace":{"label":"Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place","description":"Purchase of minerals in place.","units":{"pure":[{"start":"2009-01-01","end":"2009-12-31","val":20265,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":74768,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":12579,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011"}]}},"ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease":{"label":"Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates","description":"Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.","units":{"pure":[{"start":"2009-01-01","end":"2009-12-31","val":-977,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":-888,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-3997,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011"}]}},"ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace":{"label":"Proved Developed and Undeveloped Reserves, Sales of Minerals in Place","description":"Sales of minerals in place.","units":{"pure":[{"start":"2009-01-01","end":"2009-12-31","val":-71,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":-6005,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-8357,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011"}]}},"ProvedDevelopedReservesBOE":{"label":"Proved Developed Reserves (BOE) (Deprecated 2013-01-31)","description":"Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. \"Net\" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in \"net\" quantities if the necessary information is available to the enterprise. \"Net\" quantities do not include reserves relating to interests of others in properties owned by the enterprise. Measured in barrel of oil equivalent (BOE).","units":{"MBoe":[{"end":"2008-12-31","val":76515,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2008Q4I"},{"end":"2009-12-31","val":103707,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009Q4I"},{"end":"2010-12-31","val":184521,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010Q4I"},{"end":"2011-12-31","val":235929,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011Q4I"}]}},"ProvedUndevelopedReserveBOE":{"label":"Proved Undeveloped Reserve (BOE) (Deprecated 2013-01-31)","description":"Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. \"Net\" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in \"net\" quantities if the necessary information is available to the enterprise. \"Net\" quantities do not include reserves relating to interests of others in properties owned by the enterprise. Measured in barrel of oil equivalent (BOE).","units":{"MBoe":[{"end":"2008-12-31","val":60760,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2008Q4I"},{"end":"2009-12-31","val":107796,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009Q4I"},{"end":"2010-12-31","val":138931,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010Q4I"},{"end":"2011-12-31","val":150592,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011Q4I"}]}},"ProvisionForDoubtfulAccounts":{"label":"Accounts Receivable, Credit Loss Expense (Reversal)","description":"Amount of expense (reversal of expense) for expected credit loss on accounts receivable.","units":{"USD":[{"start":"2008-01-01","end":"2008-12-31","val":2905000,"accn":"0000950123-11-051478","fy":2010,"fp":"FY","form":"8-K","filed":"2011-05-18","frame":"CY2008"},{"start":"2008-01-01","end":"2008-12-31","val":2905000,"accn":"0000950123-11-018697","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25"},{"start":"2009-01-01","end":"2009-12-31","val":-1035000,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2009-01-01","end":"2009-12-31","val":-1035000,"accn":"0000950123-11-051478","fy":2010,"fp":"FY","form":"8-K","filed":"2011-05-18"},{"start":"2009-01-01","end":"2009-12-31","val":-1035000,"accn":"0000950123-11-018697","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25"},{"start":"2010-01-01","end":"2010-03-31","val":539000,"accn":"0000950123-11-046179","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-06","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-06-30","val":572000,"accn":"0001193125-11-212154","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05"},{"start":"2010-01-01","end":"2010-06-30","val":572000,"accn":"0000950123-10-073797","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06"},{"start":"2010-04-01","end":"2010-06-30","val":33000,"accn":"0001193125-11-212154","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05","frame":"CY2010Q2"},{"start":"2010-04-01","end":"2010-06-30","val":33000,"accn":"0000950123-10-073797","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06"},{"start":"2010-01-01","end":"2010-09-30","val":578000,"accn":"0001193125-11-295219","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-03"},{"start":"2010-01-01","end":"2010-09-30","val":578000,"accn":"0000950123-10-100561","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-04"},{"start":"2010-07-01","end":"2010-09-30","val":6000,"accn":"0001193125-11-295219","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-03","frame":"CY2010Q3"},{"start":"2010-07-01","end":"2010-09-30","val":6000,"accn":"0000950123-10-100561","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-04"},{"start":"2010-01-01","end":"2010-12-31","val":870000,"accn":"0001358071-13-000006","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":870000,"accn":"0001193125-12-076937","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"start":"2010-01-01","end":"2010-12-31","val":870000,"accn":"0000950123-11-051478","fy":2010,"fp":"FY","form":"8-K","filed":"2011-05-18"},{"start":"2010-01-01","end":"2010-12-31","val":870000,"accn":"0000950123-11-018697","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0001358071-13-000006","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0001358071-13-000006","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012"}]}},"PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear":{"label":"Purchase Obligation, to be Paid, Remainder of Fiscal Year","description":"Amount of purchase arrangement to be paid in remainder of current fiscal year. 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