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Acquisition - Price Allocation (Details) - USD ($) $ in Thousands		3 Months Ended
	Feb. 14, 2018	Mar. 31, 2018	Mar. 31, 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
Consideration paid to Forge Energy:	920,990
Proved developed properties	110,735
Proved undeveloped properties	167,170
Unproved lease acquisition costs	644,040
Inventory	293
Intangible assets	1,000
Asset retirement obligations	$ (2,248)

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
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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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The amount of identifiable intangible assets recognized as of the acquisition date.

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The amount of inventory recognized as of the acquisition date.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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