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FRESH-START ACCOUNTING - Liabilities subject to compromise (Details) - USD ($)
$ in Thousands
9 Months Ended
Oct. 01, 2019
Oct. 01, 2019
Dec. 31, 2020
Aug. 02, 2019
Feb. 15, 2018
Jul. 10, 2017
Feb. 16, 2017
Liabilities Subject to Compromise              
Liabilities subject to compromise $ 625,005 $ 625,005          
Discount on shares issued per the Senior Noteholder Subscription Rights Offering (67,840) (67,840)          
Issuance of common stock to Class 4 claimholders (75,388) (75,388)          
Gain on settlement of liabilities subject to compromise 481,777 481,777          
Gain on settlement of liabilities subject to compromise 481,777 481,777          
6.75% senior notes due 2025              
Liabilities Subject to Compromise              
Interest rate (as a percent)     6.75% 6.75% 6.75% 6.75% 6.75%
Debt 625,005 625,005          
Reorganization Adjustments              
Liabilities Subject to Compromise              
Liabilities subject to compromise $ (625,005) $ (625,005)          
Reorganization Adjustments | 6.75% senior notes due 2025              
Liabilities Subject to Compromise              
Interest rate (as a percent) 6.75% 6.75%