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Acquisition - Price Allocation (Details) - USD ($) $ in Thousands		9 Months Ended
	Feb. 14, 2018	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Common stock: 46,000,000 shares issued		$ 371,220	$ 0
Permian Basin Acquisition [Member]
Business Acquisition [Line Items]
Cash	$ 549,770
Common stock: 46,000,000 shares issued	$ 371,220
Common stock shares issued (shares)	46,000,000
Consideration paid to Forge Energy:	$ 920,990
Proved developed properties	110,325
Proved undeveloped properties	166,552
Unproved lease acquisition costs	645,068
Inventory	293
Intangible assets	1,000
Asset retirement obligations	$ (2,248)

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

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