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Acquisitions - Acquisitions (Details) a in Thousands			12 Months Ended
	Sep. 12, 2018 USD ($)	Feb. 14, 2018 USD ($) a shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Permian Basin Acquisition
Business Acquisition [Line Items]
Acres acquired | a		22
Aggregate cash consideration paid		$ 549,770,000
Shares issued as consideration (shares) | shares		46,000,000
Estimated fair value of net assets (liabilities) assumed		$ 920,990,000
Goodwill or bargain purchase		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
Finite-lived intangible asset recorded		1,000,000
Useful life of intangible asset			1 year
Other Delaware Acquisition
Business Acquisition [Line Items]
Aggregate cash consideration paid	$ 59,500,000
Goodwill or bargain purchase	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			$ 21,000,000.0	18,700,000
Noncompete agreements | Permian Basin Acquisition
Business Acquisition [Line Items]
Amortization expense of non-compete agreement			$ 100,000	$ 900,000

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