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Emergence from Voluntary Reorganization under Chapter 11 (Details)
$ in Thousands
Oct. 13, 2021
USD ($)
item
Jun. 30, 2021
Feb. 02, 2021
Dec. 31, 2020
Fresh-Start Adjustment [Line Items]        
Amount of Principal   2.00%    
Debtor Reorganization Items, Percent Of Stock   100.00%    
Original Senior Unsecured Notes Due 2021 [Member]        
Fresh-Start Adjustment [Line Items]        
Stated interest rate   7.125%    
New Senior Unsecured Notes Due 2021 [Member]        
Fresh-Start Adjustment [Line Items]        
Stated interest rate   7.125% 7.125% 7.125%
Senior Unsecured Notes Due 2024 [Member]        
Fresh-Start Adjustment [Line Items]        
Stated interest rate   7.75% 7.75% 7.75%
Subsequent Event [Member]        
Fresh-Start Adjustment [Line Items]        
Bankruptcy Claims, Number Claims Filed | item 646      
Bankruptcy Claims, Amount of Claims Filed $ 1,700,000      
Bankruptcy Claims, Number of Claims Expunged by Bankruptcy Court | item 570      
Bankruptcy Claims, Amount of Claims Expunged by Bankruptcy Court $ 1,400,000      
Subsequent Event [Member] | Class 6 General Unsecured Claims [Member]        
Fresh-Start Adjustment [Line Items]        
Bankruptcy Claims, Amount of Claims Filed 232,000      
Debtor-in-Possession Financing, Pro Rata Share $ 125