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Supplemental Information on Oil and Natural Gas Producing Activities (Unaudited) - Narrative (Details)	12 Months Ended
	Dec. 31, 2019 MBoe	Dec. 31, 2018 MBoe	Dec. 31, 2017 MBoe	Dec. 31, 2016 MBoe
Extractive Industries [Abstract]
Percentage of proved reserves estimates prepared by external engineers	0.90
Proved developed and undeveloped reserves (MBoe)	89,885	160,176	177,594	163,955
Decrease due to change in accounting (MBoe)	50,900
Decrease due to change in accounting, PUD	39,800
Decrease due to change in accounting, Remaining Proved Reserves	11,100
Revision of previous estimates due to changes in commodity pricing (MBoe)	10,900
Revision of previous estimates due to changes in well performance (MBoe)	3,200	8,300
Improved recovery (MBoe)	12,600
Change in economic life		24,900
Revision of previous estimates (MBoe)	(58,514)	(33,188)	10,879
Sales of reserves in place (MBoe)	905	6,577	1,909
Acquisitions of new reserves (MBoe)		15,350	202
Upward revision of estimates due to extensions (MBoe)	1,084	19,332	19,373

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Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, 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).

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Energy measure of increase in quantity of proved reserve of oil and gas resulting from application of improved recovery techniques, 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).

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