Annual report pursuant to Section 13 and 15(d)

CRUDE OIL AND NATURAL GAS PROPERTIES - Narrative (Details)

v3.20.4
CRUDE OIL AND NATURAL GAS PROPERTIES - Narrative (Details)
 12 Months Ended
Jul. 01, 2019
USD ($)
a
well
Dec. 31, 2020
USD ($)
a
Dec. 31, 2019
USD ($)
a
Dec. 31, 2018
USD ($)
Asset Acquisition [Line Items]        
Future cash outflow to pay for purchases of fixed assets that have occurred   $ 88,564,000 $ 161,743,000 $ 129,452,000
Development costs incurred prior to closing   $ 213,912,000 $ 753,918,000 $ 848,545,000
Area of unproven leasehold interests | a   16,531 16,464  
Anticipated future period over which excluded costs will become subject to depletion   5 years    
Unsecured Debt | Unsecured Ven Bakken Note        
Asset Acquisition [Line Items]        
Interest rate percentage 6.00%      
Principal amount $ 130,000,000.0      
VEN Bakken LLC        
Asset Acquisition [Line Items]        
Consideration transferred $ 315,280,000      
Number of net PDP wells acquired | well 90.1      
Number of proved developed nonproducing wells acquired | well 3.3      
Net acres acquired | a 18,000      
Payments to acquire producing properties $ 174,912,000      
Issuance of common stock 11,708,000      
Transaction costs $ 1,800,000      
VEN Bakken LLC | Unsecured Debt        
Asset Acquisition [Line Items]        
Liabilities incurred   $ 128,700,000    
Independent Transactions        
Asset Acquisition [Line Items]        
Consideration transferred   $ 21,600,000 $ 53,400,000  
Development costs incurred prior to closing     $ 22,600,000