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 9 Months Ended
Jul. 01, 2019
Oct. 01, 2018
Sep. 17, 2018
Jul. 27, 2018
Jul. 17, 2018
Jun. 04, 2018
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair value of net assets:                    
Proved oil and natural gas properties             $ 4,043,897 $ 4,043,897   $ 3,431,428
Fair value of consideration paid for net assets:                    
Cash consideration               210,642 $ 125,487  
Total fair value of consideration transferred             $ 19,100 $ 36,300    
VEN Bakken LLC                    
Fair value of net assets:                    
Proved oil and natural gas properties $ 322,128                  
Asset retirement cost 2,680                  
Total assets acquired 324,808                  
Asset retirement obligations (2,680)                  
Derivative instruments (9,694)                  
Net assets acquired 312,434                  
Fair value of consideration paid for net assets:                    
Cash consideration 172,066                  
Issuance of common stock 11,708                  
Unsecured VEN Bakken Note 128,660                  
Total fair value of consideration transferred $ 312,434                  
Issuance of common stock (in shares) 5,602,147                  
Share price at issuance (in dollars per share) $ 2.09                  
W Energy Acquisition                    
Fair value of net assets:                    
Proved oil and natural gas properties   $ 341,633                
Asset retirement cost   939                
Total assets acquired   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            
Issuance of common stock   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 acquired     146,778              
Asset retirement obligations     (644)              
Net assets acquired     146,134              
Fair value of consideration paid for net assets:                    
Cash consideration     48,189              
Issuance of common stock     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 acquired           60,132        
Asset retirement obligations           (154)        
Net assets acquired           59,978        
Fair value of consideration paid for net assets:                    
Cash consideration           44,738        
Issuance of common stock           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