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
3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended
Oct. 14, 2021
May 17, 2021
Sep. 30, 2020
Sep. 30, 2021
May 17, 2021
Sep. 30, 2021
Sep. 30, 2020
May 16, 2021
Dec. 31, 2020
Debt Instrument [Line Items]                  
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       117,000 $ 0   $ 907,000    
Oil and Gas Properties                  
Debt Instrument [Line Items]                  
Interest capitalized     $ 200,000 100,000 0   $ 900,000    
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       548,900,000   548,900,000      
Senior Notes | Fair Value | Level 1                  
Debt Instrument [Line Items]                  
Carrying value of notes       601,400,000   601,400,000      
Exit Facility                  
Debt Instrument [Line Items]                  
Line of credit facility, commitment fee amount   $ 150,000,000              
Remaining borrowing capacity   40,000,000     40,000,000        
Long-term debt       35,606,000   $ 35,606,000     $ 0
Exit Facility | Revolving Credit Agreement                  
Debt Instrument [Line Items]                  
Weight average interest rate           4.50%      
First-Out Term Loan                  
Debt Instrument [Line Items]                  
Long-term debt       $ 165,000,000   $ 165,000,000     0
First-Out Term Loan | Revolving Credit Agreement                  
Debt Instrument [Line Items]                  
Weight average interest rate           5.50%      
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 | 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%
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%
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%
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%
Long-term debt       0   0     $ 374,617,000
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Debtor-in-possession financing, amount arranged   $ 580,000,000     $ 580,000,000        
Revolving Credit Facility | New Credit Facility | Subsequent Event                  
Debt Instrument [Line Items]                  
Aggregate maximum principal amount $ 1,500,000,000                
Initial borrowing base amount 850,000,000                
Line of credit facility, commitment fee amount 700,000,000                
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              
Revolving Credit Facility | First-Out Term Loan                  
Debt Instrument [Line Items]                  
Credit facility outstanding   15,000,000     15,000,000        
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     $ 180,000,000        
Revolving Credit Facility | Pre-Petition Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Initial borrowing base 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       $ 115,500,000   $ 115,500,000      
Letter of Credit | New Credit Facility | Subsequent Event                  
Debt Instrument [Line Items]                  
Aggregate maximum principal amount $ 175,000,000