Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT (Narrative) (Details)

v3.21.2
LONG-TERM DEBT (Narrative) (Details) - USD ($)
shares in Millions
1 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended
May 17, 2021
Jun. 30, 2021
Jun. 30, 2020
May 17, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Oct. 08, 2020
Debt Instrument [Line Items]                
Debt instrument current ratio 100.00%              
Unused capacity, commitment fee percentage 0.50%              
Debtor-in-possession financing, letters of credit outstanding   $ 262,500,000     $ 262,500,000      
Debtor-in-possession financing, amount arranged   105,000,000     105,000,000      
Debtor-in-possession financing, borrowings outstanding   157,500,000     157,500,000      
Interest capitalized   0   $ 0   $ 710,000    
Oil and Gas Properties                
Debt Instrument [Line Items]                
Interest capitalized   0 $ 500,000 0   $ 700,000    
Senior Notes                
Debt Instrument [Line Items]                
Consideration received on transaction   550,000,000            
Number of shares issued in transaction (in shares) 19.7              
Senior Notes | Carry Value                
Debt Instrument [Line Items]                
Carrying value of notes   548,800,000     548,800,000      
Senior Notes | Fair Value | Level 1                
Debt Instrument [Line Items]                
Carrying value of notes   592,600,000     592,600,000      
Exit Facility                
Debt Instrument [Line Items]                
Line of credit facility, commitment fee amount $ 150,000,000.0              
Debt instrument net funded leverage ratio 300.00%              
Debt instrument net senior secured leverage ratio 200.00%              
Remaining borrowing capacity $ 40,000,000     $ 40,000,000        
Long-term debt   105,000,000     105,000,000   $ 0  
Exit Facility | Loan Parties                
Debt Instrument [Line Items]                
Stated interest rate 85.00%     85.00%        
Exit Facility | LIBOR | Minimum                
Debt Instrument [Line Items]                
Variable interest rate 3.00%              
Exit Facility | LIBOR | Maximum                
Debt Instrument [Line Items]                
Variable interest rate 4.00%              
Exit Facility | Base Rate | Minimum                
Debt Instrument [Line Items]                
Variable interest rate 2.00%              
Exit Facility | Base Rate | Maximum                
Debt Instrument [Line Items]                
Variable interest rate 3.00%              
First-Out Term Loan                
Debt Instrument [Line Items]                
Long-term debt   $ 180,000,000     $ 180,000,000   0  
First-Out Term Loan | LIBOR                
Debt Instrument [Line Items]                
Variable interest rate 4.50%              
First-Out Term Loan | LIBOR | Interest Rate                
Debt Instrument [Line Items]                
Variable interest rate 1.00%              
First-Out Term Loan | Base Rate                
Debt Instrument [Line Items]                
Variable interest rate 3.50%              
First-Out Term Loan | Base Rate | Interest Rate                
Debt Instrument [Line Items]                
Variable interest rate 2.00%              
8.000% senior unsecured notes due 2026                
Debt Instrument [Line Items]                
Stated interest rate   8.00%     8.00%      
Long-term debt   $ 550,000,000     $ 550,000,000   0  
8.000% senior unsecured notes due 2026 | Fresh Start Adjustments                
Debt Instrument [Line Items]                
Debt instrument interest computation basis   360-day year of twelve 30-day months            
8.000% senior unsecured notes due 2026 | Senior Notes                
Debt Instrument [Line Items]                
Debtor-in-possession financing, amount arranged $ 550,000,000     $ 550,000,000        
8.000% senior unsecured notes due 2026 | Senior Notes | Fresh Start Adjustments                
Debt Instrument [Line Items]                
Debt instrument, amount $ 550,000,000     $ 550,000,000        
Stated interest rate 8.00%     8.00%        
6.625% senior unsecured notes due 2023 | Senior Notes                
Debt Instrument [Line Items]                
Stated interest rate 6.625%     6.625%        
Long-term debt   $ 0     0   324,583,000  
6.000% senior unsecured notes due 2024 | Senior Notes                
Debt Instrument [Line Items]                
Stated interest rate 6.00%     6.00%        
Long-term debt   0     0   579,568,000  
6.375% senior unsecured notes due 2025 | Senior Notes                
Debt Instrument [Line Items]                
Stated interest rate 6.375%     6.375%        
Long-term debt   0     0   507,870,000  
6.375% senior unsecured notes due 2026 | Senior Notes                
Debt Instrument [Line Items]                
Stated interest rate 6.375%     6.375%        
Long-term debt   0     $ 0   374,617,000  
DIP Credit Facility | Revolving Credit Agreement                
Debt Instrument [Line Items]                
Weight average interest rate         4.50% 5.50%    
Revolving Credit Facility                
Debt Instrument [Line Items]                
Debtor-in-possession financing, amount arranged $ 580,000,000     $ 580,000,000        
Revolving Credit Facility | Exit Facility                
Debt Instrument [Line Items]                
Debtor-in-possession financing, amount arranged 1,500,000,000     1,500,000,000        
Revolving Credit Facility | Exit Facility | Fresh Start Adjustments                
Debt Instrument [Line Items]                
Debt instrument, amount 1,500,000,000     1,500,000,000        
Line of credit facility, commitment fee amount 580,000,000.0              
Revolving Credit Facility | First-Out Term Loan                
Debt Instrument [Line Items]                
Credit facility outstanding 15,000,000.0     15,000,000.0        
Debtor-in-possession financing, amount arranged 180,000,000     180,000,000        
Revolving Credit Facility | First-Out Term Loan | Fresh Start Adjustments                
Debt Instrument [Line Items]                
Debt instrument, amount $ 180,000,000.0     $ 180,000,000.0        
Revolving Credit Facility | Pre-petition revolving credit facility                
Debt Instrument [Line Items]                
Elected commitment amount               $ 580,000,000
Revolving Credit Agreement | Pre-petition revolving credit facility                
Debt Instrument [Line Items]                
Long-term debt   0     $ 0   292,910,000  
Revolving Credit Agreement | DIP Credit Facility                
Debt Instrument [Line Items]                
Long-term debt   0     0   $ 157,500,000  
Letter of Credit                
Debt Instrument [Line Items]                
Long-term debt   $ 114,800,000     $ 114,800,000