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Acquisitions and Divestitures (Details)			1 Months Ended	2 Months Ended	3 Months Ended	10 Months Ended	12 Months Ended
	Nov. 30, 2018 USD ($)	Jul. 31, 2017 USD ($)	Apr. 30, 2018 USD ($) a lease well $ / bbl	Feb. 28, 2017 USD ($)	Sep. 30, 2018 MBoe	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($) well	Dec. 31, 2018 USD ($)	Jul. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of property and equipment and other				$ 25,000		$ 234,292,000	$ 969,000	$ 8,212,000
Business Acquisition [Line Items]
Payments to acquire property		$ 249,000,000					$ 2,900,000
Percentage of working interest acquired		84.00%
Percentage of working interest in investment									16.00%
East Texas operating area
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of non-core oil and gas properties	$ 7,000,000
Gains on sale of assets and other, net	$ 4,000,000
Daily production (Mboe) | MBoe					0.7
Hugoton Natural Gas Field
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gains on sale of assets and other, net		$ 23,000,000
Working interest divested		78.00%
Proceeds from sale of property and equipment and other		$ 234,000,000
Chevron North Midway-Sunset Acquisition
Business Acquisition [Line Items]
Number of leases acquired | lease			2
Area of land acquired in lease (in acres) | a			214
Drilling commitment assumed			$ 35,000,000
Drilling commitment, number of wells | well			115
Drilling commitment, number of wells drilled | well							18
Consideration transferred in acquisition			$ 0
Oil and gas delivery commitments, consecutive period for which price not met which will incur a toll			30 days
Oil and gas delivery commitments, fixed price to be met, less than (in dollars per barrel) | $ / bbl			45

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