Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT - Narrative (Details)

v3.21.2
LONG-TERM DEBT - Narrative (Details)
1 Months Ended 6 Months Ended
Jun. 21, 2021
USD ($)
Feb. 18, 2021
USD ($)
Jan. 04, 2021
USD ($)
Nov. 22, 2019
Jun. 30, 2021
USD ($)
Feb. 28, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jul. 01, 2019
USD ($)
May 15, 2018
Debt Instrument [Line Items]                      
Proceeds from issuance of common stock $ 95,300,000           $ 228,199,000 $ 0      
Long-term debt         $ 801,998,000   801,998,000   $ 944,843,000    
Long-term debt, gross         813,000,000   813,000,000   949,755,000    
Reliance                      
Debt Instrument [Line Items]                      
Proceeds from issuance of common stock           $ 132,900,000          
Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Long-term debt, gross         263,000,000.0   263,000,000.0   532,000,000    
Borrowing base         725,000,000.0   725,000,000.0        
Elected commitment amount         660,000,000.0   660,000,000.0        
Maximum debt to EBITDAX ratio under debt covenant       3.50              
Minimum current ratio under debt covenant       1.00              
Minimum percent of the fair value of reserves secured by mortgages       90.00%              
Revolving Credit Facility | Federal funds effective rate                      
Debt Instrument [Line Items]                      
Basis spread on variable rate       0.50%              
Revolving Credit Facility | LIBOR                      
Debt Instrument [Line Items]                      
Basis spread on variable rate       1.00%              
Revolving Credit Facility | LIBOR | Minimum                      
Debt Instrument [Line Items]                      
Basis spread on variable rate       2.00%              
Revolving Credit Facility | LIBOR | Maximum                      
Debt Instrument [Line Items]                      
Basis spread on variable rate       3.00%              
Revolving Credit Facility | Base rate | Minimum                      
Debt Instrument [Line Items]                      
Basis spread on variable rate       1.00%              
Revolving Credit Facility | Base rate | Maximum                      
Debt Instrument [Line Items]                      
Basis spread on variable rate       2.00%              
Permian                      
Debt Instrument [Line Items]                      
Proceeds from issuance of common stock         95,300,000            
Unsecured Debt | VEN Bakken LLC                      
Debt Instrument [Line Items]                      
Interest rate                   6.00%  
Unsecured Notes due 2028 | Unsecured Debt                      
Debt Instrument [Line Items]                      
Principal amount   $ 550,000,000.0     $ 550,000,000.0   $ 550,000,000.0        
Interest rate   8.125%     8.125%   8.125%        
Proceeds from the issuance of long-term debt             $ 538,400,000        
Long-term debt, gross         $ 550,000,000   550,000,000   0    
Default period   30 days                  
Acceleration threshold amount   $ 35,000,000.0                  
Judgment discharge or stay period   60 days                  
Unsecured Notes due 2028 | Unsecured Debt | Estimated Fair Value                      
Debt Instrument [Line Items]                      
Fair value of long-term debt         595,400,000   595,400,000        
Unsecured Notes due 2028 | Unsecured Debt | Redemption Period 1                      
Debt Instrument [Line Items]                      
Redemption price, percentage of principal amount repurchased   100.00%                  
Unsecured Notes due 2028 | Unsecured Debt | Redemption Period 2                      
Debt Instrument [Line Items]                      
Redemption price percentage   104.063%                  
Unsecured Notes due 2028 | Unsecured Debt | Redemption Period 3                      
Debt Instrument [Line Items]                      
Redemption price percentage   102.031%                  
Unsecured Notes due 2028 | Unsecured Debt | Redemption Period 4                      
Debt Instrument [Line Items]                      
Redemption price percentage   100.00%                  
Unsecured VEN Bakken Note due 2022 | Unsecured Debt                      
Debt Instrument [Line Items]                      
Principal amount                   $ 130,000,000.0  
Long-term debt, gross         0   0   130,000,000    
Repayments of long-term debt   $ 65,000,000.0 $ 65,000,000.0                
Second Lien Notes due 2023 | Second Lien Notes                      
Debt Instrument [Line Items]                      
Interest rate                     8.50%
Fair value of long-term debt         16,000,000.0   16,000,000.0        
Long-term debt, gross         0   0   $ 287,755,000    
Second Lien Notes due 2023 | Second Lien Notes | Exchange Agreement                      
Debt Instrument [Line Items]                      
Long-term debt         $ 15,700,000   15,700,000        
Second Lien Notes due 2023 | Second Lien Notes | Cash Tender Offer                      
Debt Instrument [Line Items]                      
Aggregate principal amount of debt repurchased and retired           $ 272,100,000          
Cost of redemption and retirement of debt, including premiums             $ 280,200,000