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Acquisition - Additional Information (Details) - Permian Basin Acquisition [Member]
a in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Feb. 14, 2018
USD ($)
a
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Business Acquisition [Line Items]      
Net acres acquired | a 22    
Cash $ 549,770    
Aggregate consideration paid in shares (shares) | shares 46,000,000    
Consideration paid to Forge Energy $ 920,990    
Actual total revenue of acquiree included in condensed financials   $ 20,000 $ 31,600
Actual operating income of acquiree included in condensed financials   6,800 10,200
Finite lived intangible asset $ 1,000    
Noncompete Agreements [Member]      
Business Acquisition [Line Items]      
Useful life of acquired intangible asset 1 year    
Amortization of Intangible Assets   $ 300 $ 400