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period greater than or equal to one year but less than two years after completion of drilling at balance sheet 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Stock, Value, Issued","description":"Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). 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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These are billings to the non-operators associated with the operation of wells and are based on those owners' working interests in the wells. 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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":[{"start":"2014-01-01","end":"2014-12-31","val":440621,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":253173,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"start":"2015-01-01","end":"2015-12-31","val":253173,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":249430,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"start":"2016-01-01","end":"2016-12-31","val":249430,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":240206,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2017"}]}},"ProvedDevelopedAndUndevelopedReserveNetEnergy":{"label":"Proved Developed and Undeveloped Reserve, Net (Energy)","description":"Energy measure of proved reserve of oil and gas, 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":[{"end":"2013-12-31","val":1084125,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1351091,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"end":"2014-12-31","val":1351091,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2014Q4I"},{"end":"2015-12-31","val":1225811,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"end":"2015-12-31","val":1225811,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2015Q4I"},{"end":"2016-12-31","val":1274864,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"end":"2016-12-31","val":1274864,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2016Q4I"},{"end":"2017-12-31","val":1330995,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2017Q4I"}]}},"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":"2014-01-01","end":"2014-12-31","val":63579,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":80926,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"start":"2015-01-01","end":"2015-12-31","val":80926,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":79390,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"start":"2016-01-01","end":"2016-12-31","val":79390,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":88562,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2017"}]}},"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":"2014-01-01","end":"2014-12-31","val":1100,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":1696,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2017"}]}},"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":"2014-01-01","end":"2014-12-31","val":105,"accn":"0000732834-15-000004","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24"},{"start":"2014-01-01","end":"2014-12-31","val":-107949,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-297198,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"start":"2015-01-01","end":"2015-12-31","val":-297198,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":-110474,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"start":"2016-01-01","end":"2016-12-31","val":-110474,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":-82012,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2017"}]}},"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":{"MBbls":[{"start":"2014-01-01","end":"2014-12-31","val":53,"accn":"0000732834-15-000004","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014"}],"MMcf":[{"start":"2014-01-01","end":"2014-12-31","val":315,"accn":"0000732834-15-000004","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014"}]}},"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":"2014-01-01","end":"2014-12-31","val":3227,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":329,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"start":"2015-01-01","end":"2015-12-31","val":329,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":10513,"accn":"0000732834-17-000004","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-22"},{"start":"2016-01-01","end":"2016-12-31","val":10513,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":15197,"accn":"0000732834-18-000003","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2017"}]}},"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":{"bbl":[{"end":"2010-12-31","val":140389,"accn":"0001193125-13-080751","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2010Q4I"},{"end":"2011-12-31","val":205235,"accn":"0001193125-13-080751","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":317786,"accn":"0001193125-13-080751","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2012Q4I"}],"MBoe":[{"end":"2009-12-31","val":113567,"accn":"0001193125-12-077054","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009Q4I"},{"end":"2010-12-31","val":140389,"accn":"0001193125-12-077054","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2010Q4I"},{"end":"2011-12-31","val":205235,"accn":"0001193125-12-077054","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2011Q4I"}]}},"ProvedDevelopedReservesBOE1":{"label":"Proved Developed Reserves 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Expense":{"label":"Results 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