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
Jun. 04, 2018
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Fair value of net assets:                
Proved oil and natural gas properties         $ 3,511,605   $ 3,511,605 $ 3,431,428
Total Assets         1,395,779   1,395,779 $ 1,503,645
Fair value of consideration paid for net assets:                
Cash consideration         8,122 $ 5,107    
Total fair value of consideration transferred         $ 8,400      
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 51,500,000            
Share price at issuance (in dollars per share) $ 4.29 $ 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         $ 68,400  
Value of shares transferred   88,592            
Contingent consideration   9,353            
Total fair value of consideration transferred   $ 146,134            
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