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For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).","units":{"MBoe":[{"end":"2011-12-31","val":97651,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2011Q4I"},{"end":"2012-12-31","val":80486,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2012-12-31","val":80486,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2012Q4I"},{"end":"2013-12-31","val":80695,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2013-12-31","val":80695,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2013-12-31","val":80695,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":91940,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":91940,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2014-12-31","val":91940,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":13321,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":13321,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016Q4I"}]}},"ProvedDevelopedAndUndevelopedReserveProductionEnergy":{"label":"Proved Developed and Undeveloped Reserve, Production (Energy)","description":"Energy measure of decrease in quantity of proved reserve of oil and gas resulting from production, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).","units":{"MBoe":[{"start":"2012-01-01","end":"2012-12-31","val":10058,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":10264,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":10264,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":8998,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":8998,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":8998,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":6471,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":6471,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016"}]}},"ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy":{"label":"Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy)","description":"Energy measure of increase in quantity of proved reserve of oil and gas resulting from purchase of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).","units":{"MBoe":[{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":6748,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":6748,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":6748,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016"}]}},"ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy":{"label":"Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy)","description":"Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).","units":{"MBoe":[{"start":"2012-01-01","end":"2012-12-31","val":-21440,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-590,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":-590,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":4266,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":4266,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":4266,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-15939,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":-15939,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016"}]}},"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":{"Mcfe":[{"start":"2009-01-01","end":"2009-12-31","val":42297000,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":56523000,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":65049000,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011"}]}},"ProvedDevelopedAndUndevelopedReservesImprovedRecovery":{"label":"Proved Developed and Undeveloped Reserves, Improved Recovery","description":"Changes in proved reserve estimates resulting from application of improved recovery techniques.","units":{"Mcfe":[{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000067716-12-000031","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":{"Mcfe":[{"end":"2008-12-31","val":810371000,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2008Q4I"},{"end":"2009-12-31","val":653724000,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009Q4I"},{"end":"2010-12-31","val":645596000,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010Q4I"},{"end":"2011-12-31","val":585908000,"accn":"0000067716-12-000031","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":{"Mcfe":[{"start":"2009-01-01","end":"2009-12-31","val":-75299000,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":-69963000,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-66596000,"accn":"0000067716-12-000031","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":{"Mcfe":[{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":60991000,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":1486000,"accn":"0000067716-12-000031","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":{"Mcfe":[{"start":"2009-01-01","end":"2009-12-31","val":-122135000,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":-55477000,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-59627000,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011"}]}},"ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy":{"label":"Proved Developed and Undeveloped Reserves, Sale of Mineral in Place (Energy)","description":"Energy measure of decrease in quantity of proved reserve of oil and gas resulting from sale of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).","units":{"MBoe":[{"start":"2012-01-01","end":"2012-12-31","val":423,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":7987,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2013-01-01","end":"2013-12-31","val":7987,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":14796,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"start":"2014-01-01","end":"2014-12-31","val":14796,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":14796,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":57097,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"start":"2015-01-01","end":"2015-12-31","val":57097,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":13321,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016"}]}},"ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace":{"label":"Proved Developed and Undeveloped Reserves, Sales of Minerals in Place","description":"Sales of minerals in place.","units":{"Mcfe":[{"start":"2009-01-01","end":"2009-12-31","val":-1510000,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":-202000,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0000067716-12-000031","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011"}]}},"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":"2012-12-31","val":69131,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20","frame":"CY2012Q4I"},{"end":"2013-12-31","val":66140,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2013-12-31","val":66140,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19","frame":"CY2013Q4I"},{"end":"2014-12-31","val":65086,"accn":"0000067716-15-000027","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-20"},{"end":"2014-12-31","val":65086,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2014-12-31","val":65086,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2014Q4I"},{"end":"2015-12-31","val":11865,"accn":"0000067716-16-000116","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-19"},{"end":"2015-12-31","val":11865,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0,"accn":"0000067716-17-000017","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016Q4I"}]}},"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 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