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changes.","units":{"USD":[{"start":"2007-01-01","end":"2007-12-31","val":-23479000,"accn":"0001047469-10-001573","fy":2009,"fp":"FY","form":"10-K","filed":"2010-03-01","frame":"CY2007"},{"start":"2008-01-01","end":"2008-06-30","val":1126000,"accn":"0001047469-09-007411","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-08-07"},{"start":"2008-01-01","end":"2008-09-30","val":-9189000,"accn":"0001047469-09-009749","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-11-06"},{"start":"2008-01-01","end":"2008-12-31","val":-7480000,"accn":"0001047469-10-001573","fy":2009,"fp":"FY","form":"10-K","filed":"2010-03-01"},{"start":"2008-01-01","end":"2008-12-31","val":-7480000,"accn":"0001047469-11-001208","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-24","frame":"CY2008"},{"start":"2009-01-01","end":"2009-06-30","val":3291000,"accn":"0001047469-09-007411","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-08-07"},{"start":"2009-01-01","end":"2009-06-30","val":3291000,"accn":"0001047469-10-007158","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06"},{"start":"2009-01-01","end":"2009-09-30","val":2948000,"accn":"0001047469-09-009749","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-11-06"},{"start":"2009-01-01","end":"2009-09-30","val":2948000,"accn":"0001047469-10-009141","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-03"},{"start":"2009-01-01","end":"2009-12-31","val":465016000,"accn":"0001047469-10-001573","fy":2009,"fp":"FY","form":"10-K","filed":"2010-03-01"},{"start":"2009-01-01","end":"2009-12-31","val":465016000,"accn":"0001047469-11-001208","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-24"},{"start":"2009-01-01","end":"2009-12-31","val":465016000,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2009"},{"start":"2010-01-01","end":"2010-03-31","val":-253443000,"accn":"0001047469-11-004388","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-03","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-06-30","val":-266435000,"accn":"0001047469-10-007158","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06"},{"start":"2010-01-01","end":"2010-06-30","val":-266435000,"accn":"0001104659-11-045246","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"start":"2010-01-01","end":"2010-09-30","val":-215622000,"accn":"0001047469-10-009141","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-03"},{"start":"2010-01-01","end":"2010-09-30","val":-215622000,"accn":"0000038079-11-000081","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"start":"2010-01-01","end":"2010-12-31","val":-249076000,"accn":"0001047469-11-001208","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-24"},{"start":"2010-01-01","end":"2010-12-31","val":-249076000,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22"},{"start":"2010-01-01","end":"2010-12-31","val":-249076000,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":-54837000,"accn":"0001047469-11-004388","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-03"},{"start":"2011-01-01","end":"2011-03-31","val":-54837000,"accn":"0000038079-12-000040","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-02","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":261004000,"accn":"0001104659-11-045246","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"start":"2011-01-01","end":"2011-06-30","val":261004000,"accn":"0000038079-12-000085","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-01"},{"start":"2011-01-01","end":"2011-09-30","val":52809000,"accn":"0000038079-11-000081","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"start":"2011-01-01","end":"2011-09-30","val":52809000,"accn":"0000038079-12-000106","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30"},{"start":"2011-01-01","end":"2011-12-31","val":-214268000,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-214268000,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":-214268000,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"start":"2011-01-01","end":"2011-12-31","val":-214268000,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":-2135000,"accn":"0000038079-12-000040","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-02"},{"start":"2012-01-01","end":"2012-03-31","val":-2135000,"accn":"0000038079-13-000025","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-2332000,"accn":"0000038079-12-000085","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-01"},{"start":"2012-01-01","end":"2012-06-30","val":-2332000,"accn":"0000038079-13-000068","fy":2013,"fp":"Q2","form":"10-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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' 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Exploration costs also include costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, the maintenance of land and lease records, dry hole contributions and bottom hole contributions, costs of drilling and equipping exploratory wells and costs of drilling exploratory-type stratigraphic test wells.\"","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":3427000,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":577000,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":577000,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"start":"2010-01-01","end":"2010-12-31","val":641000,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":57000,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":57000,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"start":"2011-01-01","end":"2011-12-31","val":3940000,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2012-01-01","end":"2012-12-31","val":194000,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":194000,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"start":"2012-01-01","end":"2012-12-31","val":37614000,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2013-01-01","end":"2013-12-31","val":4722000,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2013"},{"start":"2013-01-01","end":"2013-12-31","val":4722000,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"}]}},"ExplorationCostsCumulative":{"label":"Exploration Costs, Cumulative","description":"\"The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, 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: 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. Exploration costs also include costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, the maintenance of land and lease records, dry hole contributions and bottom hole contributions, costs of drilling and equipping exploratory wells and costs of drilling exploratory-type stratigraphic test wells.\"","units":{"USD":[{"end":"2012-12-31","val":45622000,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"},{"end":"2013-12-31","val":5550000,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2013Q4I"},{"end":"2013-12-31","val":5550000,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"}]}},"ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts":{"label":"Extensions, Discoveries, Additions and Improved Recovery, Less Related Costs","description":"Amount of increase 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Examples include, but are not limited to, desks, chairs, tables, and bookcases.","units":{"USD":[{"end":"2013-12-31","val":11167000,"accn":"0001558370-15-000424","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":14030000,"accn":"0001558370-15-000424","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2014-12-31","val":14030000,"accn":"0001558370-15-000885","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-11"},{"end":"2014-12-31","val":14030000,"accn":"0001558370-15-001544","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07"},{"end":"2014-12-31","val":14030000,"accn":"0001558370-15-002518","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-09"},{"end":"2014-12-31","val":14030000,"accn":"0001558370-16-004332","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24","frame":"CY2014Q4I"},{"end":"2015-03-31","val":14774000,"accn":"0001558370-15-000885","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-11","frame":"CY2015Q1I"},{"end":"2015-06-30","val":15703000,"accn":"0001558370-15-001544","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07","frame":"CY2015Q2I"},{"end":"2015-09-30","val":15765000,"accn":"0001558370-15-002518","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-09","frame":"CY2015Q3I"},{"end":"2015-12-31","val":15838000,"accn":"0001558370-16-004332","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24"},{"end":"2015-12-31","val":15838000,"accn":"0001558370-16-006000","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":16002000,"accn":"0001558370-16-006000","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-16","frame":"CY2016Q1I"}]}},"GainLossOnContractTermination":{"label":"Gain (Loss) on Contract Termination","description":"Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.","units":{"USD":[{"start":"2014-01-01","end":"2014-03-31","val":-5000000,"accn":"0000038079-14-000081","fy":2014,"fp":"Q1","form":"10-Q/A","filed":"2014-10-01","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-03-31","val":-5000000,"accn":"0000038079-14-000031","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-06"},{"start":"2015-01-01","end":"2015-06-30","val":4500000,"accn":"0001558370-15-001544","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07"}]}},"GainLossOnDerivativeInstrumentsNetPretax":{"label":"Gain (Loss) on Derivative Instruments, Net, Pretax","description":"Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax 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ptIncome":{"label":"Effective 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entity as evidenced by a written promise to pay, due within 1 year (or 1 business cycle).","units":{"USD":[{"end":"2010-12-31","val":0,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2010Q4I"},{"end":"2010-12-31","val":0,"accn":"0000038079-11-000081","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"end":"2011-09-30","val":0,"accn":"0000038079-11-000081","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08","frame":"CY2011Q3I"}]}},"NumberOfOperatingSegments":{"label":"Number of Operating Segments","description":"Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.","units":{"segment":[{"start":"2014-01-01","end":"2014-12-31","val":1,"accn":"0001558370-15-000424","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":1,"accn":"0001558370-16-004332","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-24","frame":"CY2015"}]}},"NumberOfReportableSegments":{"label":"Number of Reportable Segments","description":"Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.","units":{"segment":[{"start":"2014-01-01","end":"2014-12-31","val":1,"accn":"0001558370-15-000424","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014"}]}},"OilAndGasJointInterestBillingReceivablesCurrent":{"label":"Oil and Gas Joint Interest Billing Receivables, Current","description":"Current portion of accounts receivable attributable to joint interest partners in oil and gas properties. These are billings to the non-operators associated with the operation of wells and are based on those owners' working interests in the wells. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if 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This item includes treasury stock repurchased by the entity. 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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":15,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","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":3,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","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":{"Bcfe":[{"start":"2009-01-01","end":"2009-12-31","val":509.585,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":281.642,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":300.562,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2011"}],"MMcfe":[{"start":"2009-01-01","end":"2009-12-31","val":509585,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":281642,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":300562,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","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":{"MMcfe":[{"end":"2008-12-31","val":2377595,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2008Q4I"},{"end":"2009-12-31","val":1798177,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2009Q4I"},{"end":"2010-12-31","val":1867681,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2010Q4I"},{"end":"2011-12-31","val":1904386,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2011Q4I"}]}},"ProvedDevelopedAndUndevelopedReservesProduction":{"label":"Proved Developed and Undeveloped Reserves, Production","description":"Production of proved reserves.","units":{"MMcfe":[{"start":"2009-01-01","end":"2009-12-31","val":154483,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":137022,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":122367,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2011"}]}},"ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace":{"label":"Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place","description":"Purchase of minerals in place.","units":{"MMcfe":[{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":6044,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","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":{"Bcfe":[{"start":"2009-01-01","end":"2009-12-31","val":-383.72,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":-32.527,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-120.383,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2011"}],"MMcfe":[{"start":"2009-01-01","end":"2009-12-31","val":-383720,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":-32527,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-120383,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2011"}]}},"ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace":{"label":"Proved Developed and Undeveloped Reserves, Sales of Minerals in Place","description":"Sales of minerals in place.","units":{"MMcfe":[{"start":"2009-01-01","end":"2009-12-31","val":550800,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":48633,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":21107,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","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":"2009-12-31","val":187032,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2009Q4I"},{"end":"2010-12-31","val":189627,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010Q4I"},{"end":"2011-12-31","val":173012,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":156214,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"}]}},"ProvedDevelopedReservesBOE1":{"label":"Proved Developed Reserves (Energy)","description":"Energy measure of interests in proved developed reserves of 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.","units":{"MBoe":[{"end":"2010-12-31","val":189627,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2010Q4I"},{"end":"2010-12-31","val":189627,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2011-12-31","val":173012,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2011Q4I"},{"end":"2011-12-31","val":173012,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2012-12-31","val":156214,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2012Q4I"},{"end":"2012-12-31","val":156214,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2013-12-31","val":69063,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2013Q4I"},{"end":"2013-12-31","val":69063,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"}],"Mcfe":[{"end":"2010-12-31","val":1137759000,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2010Q4I"},{"end":"2010-12-31","val":1137759000,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2011-12-31","val":1038074000,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2011Q4I"},{"end":"2011-12-31","val":1038074000,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2012-12-31","val":937286000,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2012Q4I"},{"end":"2012-12-31","val":937286000,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2013-12-31","val":414378000,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2013Q4I"},{"end":"2013-12-31","val":414378000,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"}]}},"ProvedDevelopedReservesVolume":{"label":"Proved Developed Reserves (Volume)","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 does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as \"barrels\" for oil and synthetic oil reserves or \"cubic feet\" or \"cubic meters\" for natural gas and synthetic gas reserves.","units":{"MMcfe":[{"end":"2008-12-31","val":1451824,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2008Q4I"},{"end":"2009-12-31","val":1122189,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2009Q4I"},{"end":"2010-12-31","val":1137759,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2010Q4I"},{"end":"2011-12-31","val":1038074,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","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":"2009-12-31","val":112665,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2009Q4I"},{"end":"2010-12-31","val":121654,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010Q4I"},{"end":"2011-12-31","val":144385,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-12-31","val":70882,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"}]}},"ProvedUndevelopedReserveBOE1":{"label":"Proved Undeveloped Reserves (Energy)","description":"Energy measure of proved undeveloped reserves of 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.","units":{"MBoe":[{"end":"2010-12-31","val":121654,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2010Q4I"},{"end":"2010-12-31","val":121654,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2011-12-31","val":144385,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2011Q4I"},{"end":"2011-12-31","val":144385,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2012-12-31","val":70882,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2012Q4I"},{"end":"2012-12-31","val":70882,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2013-12-31","val":35087,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2013Q4I"},{"end":"2013-12-31","val":35087,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"}],"Mcfe":[{"end":"2010-12-31","val":729922000,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2010Q4I"},{"end":"2010-12-31","val":729922000,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2011-12-31","val":866312000,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2011Q4I"},{"end":"2011-12-31","val":866312000,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2012-12-31","val":425289000,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2012Q4I"},{"end":"2012-12-31","val":425289000,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2013-12-31","val":210523000,"accn":"0000038079-14-000080","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-10-01","frame":"CY2013Q4I"},{"end":"2013-12-31","val":210523000,"accn":"0000038079-14-000018","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"}]}},"ProvedUndevelopedReserveVolume":{"label":"Proved Undeveloped Reserve (Volume)","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 renewable 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 does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as \"barrels\" for oil and synthetic oil reserves or \"cubic feet\" or \"cubic meters\" for natural gas and synthetic gas reserves.","units":{"MMcfe":[{"end":"2008-12-31","val":925771,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2008Q4I"},{"end":"2009-12-31","val":675988,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2009Q4I"},{"end":"2010-12-31","val":729922,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2010Q4I"},{"end":"2011-12-31","val":866312,"accn":"0000038079-12-000013","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2011Q4I"}]}},"PurchaseObligation":{"label":"Purchase Obligation","description":"Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.","units":{"USD":[{"end":"2012-12-31","val":2180000,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"}]}},"PurchaseObligationDueAfterFifthYear":{"label":"Purchase Obligation, to be Paid, after Year Five","description":"Amount of purchase arrangement to be paid after fifth fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":0,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"}]}},"PurchaseObligationDueInFifthYear":{"label":"Purchase Obligation, to be Paid, Year Five","description":"Amount of purchase arrangement to be paid in fifth fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":0,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"}]}},"PurchaseObligationDueInFourthYear":{"label":"Purchase Obligation, to be Paid, Year Four","description":"Amount of purchase arrangement to be paid in fourth fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":0,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"}]}},"PurchaseObligationDueInNextTwelveMonths":{"label":"Purchase Obligation, to be Paid, Year One","description":"Amount of purchase arrangement to be paid in next fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":1935000,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"}]}},"PurchaseObligationDueInSecondYear":{"label":"Purchase Obligation, to be Paid, Year Two","description":"Amount of purchase arrangement to be paid in second fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":140000,"accn":"0000038079-13-000016","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2012Q4I"}]}},"PurchaseObligationDueInThirdYear":{"label":"Purchase Obligation, to be Paid, Year Three","description":"Amount of purchase arrangement to be paid in third fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. 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Amount excludes temporary equity. Alternate caption for the concept is permanent 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