Quarterly report pursuant to Section 13 or 15(d)

CRUDE OIL AND NATURAL GAS PROPERTIES - Fair Values of the Net Assets and Liabilities as of the Date of Acquisition (Details)

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CRUDE OIL AND NATURAL GAS PROPERTIES - Fair Values of the Net Assets and Liabilities as of the Date of Acquisition (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Oct. 01, 2018
Sep. 17, 2018
Jul. 27, 2018
Jul. 17, 2018
Jun. 04, 2018
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Fair value of net assets:                  
Proved oil and natural gas properties           $ 3,607,214 $ 3,607,214   $ 3,431,428
Total Assets           1,494,391 1,494,391   $ 1,503,645
Fair value of consideration paid for net assets:                  
Cash consideration             19,438 $ 48,975  
Total fair value of consideration transferred           $ 11,300 $ 19,700    
W Energy Acquisition                  
Fair value of net assets:                  
Proved oil and natural gas properties $ 341,633                
Asset retirement cost 939                
Total Assets 342,572                
Asset retirement obligations (939)                
Net assets acquired 341,633                
Fair value of consideration paid for net assets:                  
Cash consideration 97,838   $ 117,100            
Value of shares transferred 220,836                
Contingent consideration 22,959                
Total fair value of consideration transferred $ 341,633                
Issuance of common stock (in shares) 51,476,961                
Share price at issuance (in dollars per share) $ 4.29                
Pivotal Entities                  
Fair value of net assets:                  
Proved oil and natural gas properties   $ 146,134              
Asset retirement cost   644              
Total Assets   146,778              
Asset retirement obligations   (644)              
Net assets acquired   146,134              
Fair value of consideration paid for net assets:                  
Cash consideration   48,189              
Value of shares transferred   88,592              
Contingent consideration   9,353              
Total fair value of consideration transferred   $ 146,134   $ 68,400          
Issuance of common stock (in shares)   25,753,578              
Share price at issuance (in dollars per share)   $ 3.44              
Salt Creek Oil and Gas, LLC                  
Fair value of net assets:                  
Proved oil and natural gas properties         $ 59,978        
Asset retirement cost         154        
Total Assets         60,132        
Asset retirement obligations         (154)        
Net assets acquired         59,978        
Fair value of consideration paid for net assets:                  
Cash consideration         44,738        
Value of shares transferred         15,240        
Total fair value of consideration transferred         $ 59,978        
Issuance of common stock (in shares)         6,000,000.0        
Share price at issuance (in dollars per share)         $ 2.54