Quarterly report pursuant to Section 13 or 15(d)

FRESH START ACCOUNTING (Reorganization Adjustment to Liabilities Subject to Compromise and Gain on Liabilities Subject to Compromise) (Details)

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FRESH START ACCOUNTING (Reorganization Adjustment to Liabilities Subject to Compromise and Gain on Liabilities Subject to Compromise) (Details) - USD ($)
$ in Thousands
 5 Months Ended
May 17, 2021
Sep. 30, 2021
Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]      
Liabilities subject to compromise $ 2,224,449 $ 0 $ 2,293,480
General Unsecured Claims settled via Class 4A, 4B, and 5B distributions      
Reorganization, Chapter 11 [Line Items]      
Liabilities subject to compromise 74,098    
Predecessor Senior Notes and associated interest      
Reorganization, Chapter 11 [Line Items]      
Liabilities subject to compromise 1,842,035    
Pre-Petition Revolving Credit Facility      
Reorganization, Chapter 11 [Line Items]      
Liabilities subject to compromise 197,500    
Reinstatement of Predecessor Claims as Successor liabilities      
Reorganization, Chapter 11 [Line Items]      
Liabilities subject to compromise 45,475    
Reinstatement of Predecessor asset retirement obligations      
Reorganization, Chapter 11 [Line Items]      
Liabilities subject to compromise 65,341    
Reorganization Adjustments      
Reorganization, Chapter 11 [Line Items]      
Liabilities subject to compromise (2,224,449)    
Pre-petition General Unsecured Claims Settled at Emergence 74,098    
Predecessor Senior Notes Claims settled at Emergence 1,842,035    
Pre-Petition Revolving Credit Facility 197,500    
Rollover of Pre-Petition Revolving Credit Facility into Exit RBL Facility (197,500)    
Accrued payable for claims to be settled via Unsecured Claims Distribution Trust (1,000)    
Accrued payable for claims to be settled via Convenience Claims Cash Pool (3,000)    
Accrued payable for claims to be settled via Parent Cash Pool (10,000)    
Accrued payable for shares to be transferred to trust (54,109)    
Issuance of New Common Stock to settle Predecessor liabilities (639,666)    
Issuance of Successor Senior Notes in settlement of Class 4B and 5B claims (550,000)    
Gain on settlement of liabilities subject to compromise $ 658,358