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Acquisitions and Divestitures - Allocation of Purchase Price (Details) - USD ($) $ in Thousands		1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 14, 2018	Dec. 31, 2020	Nov. 19, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Combination, Consideration Transferred [Abstract]
Common stock: 46,000,000 shares issued		$ 0	$ 0	$ 0	$ 371,220
Permian Basin Acquisition
Business Combination, Consideration Transferred [Abstract]
Cash	$ 549,770
Common stock: 46,000,000 shares issued	371,220
Consideration paid to Forge Energy:	$ 920,990
Shares issued as consideration (in shares)	46,000,000
Recognized amounts of identifiable assets acquired and liabilities assumed:
Proved developed properties	$ 110,325
Proved undeveloped properties	166,552
Unproved lease acquisition costs	645,068
Inventory	293
Intangible assets	1,000
Liabilities assumed [Abstract]
Asset retirement obligations	(2,248)
Recognized amounts of identifiable assets acquired and liabilities assumed:	$ 920,990

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Number of shares of equity interests issued or issuable to acquire entity.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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