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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS - Deferred Tax Asset Valuation Allowance (Details) - Deferred Tax Asset Valuation Allowance - USD ($)
$ in Thousands
 3 Months Ended 4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2020
May 01, 2019
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2018
Movement in Valuation Allowances and Reserves          
Balance at Beginning of Period   $ 693,541 $ 719,486 $ 720,622 $ 678,118
Charges to Costs, Expenses and Other   714,520 1,870 3,047 11,277
Reversal   (316,374) (734) (444) 0
Impact of fresh start accounting   (343,662) 0 0 0
Adjustments $ 1,100,000 (28,539) 0 1,094,866 4,146
Balance at End of Period $ 1,818,091 $ 719,486 $ 720,622 $ 1,818,091 $ 693,541