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Acquisitions and Divestitures - Acquisitions (Details) a in Thousands			12 Months Ended
	Sep. 12, 2018 USD ($)	Feb. 14, 2018 USD ($) a shares	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)	Nov. 19, 2020 USD ($)	Nov. 18, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 70,534,000		$ 70,534,000	$ 0	$ 0
Permian Basin Acquisition
Business Acquisition [Line Items]
Acres acquired | a		22
Aggregate cash consideration paid		$ 549,770,000
Shares issued as consideration (in shares) | shares		46,000,000
Assets acquired and liabilities assumed		$ 920,990,000
Goodwill		0
Deferred tax amounts recognized		$ 0
Total revenue of acquiree included in consolidated financial statements				$ 71,700,000
Operating loss of acquiree included in consolidated financial statements				$ 15,600,000
Other Delaware Acquisition
Business Acquisition [Line Items]
Aggregate cash consideration paid	$ 59,500,000
Goodwill	0
Estimated fair value of assets acquired and liabilities assumed	$ 59,500,000
Forge Energy | Permian Basin Acquisition
Business Acquisition [Line Items]
Security deposit								$ 47,300,000
Several Acreage and Producing Assets
Business Acquisition [Line Items]
Acquisitions of oil and gas properties			$ 0

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