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Acquisitions - Acquisitions (Details)
$ in Thousands
12 Months Ended
Sep. 12, 2018
USD ($)
Feb. 14, 2018
USD ($)
a
shares
Apr. 25, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]            
Acquisitions of oil and gas properties         $ 61,874 $ 781,522
Permian Basin Acquisition            
Business Acquisition [Line Items]            
Acres acquired | a   22,000        
Aggregate cash consideration paid   $ 549,770        
Shares issued as consideration (shares) | shares   46,000,000        
Estimated fair value of assets acquired and liabilities assumed   $ 920,990        
Total revenue of acquiree included in consolidated financial statements       $ 71,700    
Operating loss of acquiree included in consolidated financial statements       15,600    
Finite-lived intangible asset recorded   1,000        
Other Delaware Acquisition            
Business Acquisition [Line Items]            
Estimated fair value of assets acquired and liabilities assumed $ 59,500          
MIdstream Assets Acquisition            
Business Acquisition [Line Items]            
Estimated fair value of assets acquired and liabilities assumed     $ 12,700      
Installment notes payable     4,900      
Fair value of assets acquired     $ 12,700      
Forge Energy | Permian Basin Acquisition            
Business Acquisition [Line Items]            
Security Deposit   $ 47,300        
Several Acreage and Producing Assets            
Business Acquisition [Line Items]            
Acquisitions of oil and gas properties       18,700 $ 6,100  
Noncompete agreements | Permian Basin Acquisition            
Business Acquisition [Line Items]            
Useful life of intangible asset   1 year        
Amortization expense of non-compete agreement       $ 900