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FRESH START ACCOUNTING - Reorganization Adjustments - Cumulative Effect of Emergence (Details) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 8 Months Ended 12 Months Ended
May 01, 2019
May 01, 2019
Jun. 30, 2019
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
May 01, 2019
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2018
Reorganizations [Abstract]                    
Gain on settlement of Liabilities subject to compromise $ 7,192,374           $ 7,192,374 $ 0 $ 0 $ (275)
Payment of professional fees upon emergence (11,509)                  
Payment of success fees upon emergence (86,065)                  
Cancellation of unvested stock-based compensation awards (1,530)                  
Cancellation of Predecessor prepaid director and officer insurance policy (2,331)                  
Write-off of debt issuance and Mandatorily Redeemable Preferred Stock costs incurred at emergence (8,726)                  
Total Reorganization items, net 7,082,213 $ (9,497,944) $ 0 $ 0 $ 0 $ 36,118 $ (9,461,826) $ 0 $ 0 $ 356,119
Income tax benefit 102,914                  
Cancellation of Predecessor Equity 2,074,190                  
Issuance of Successor Equity to prior equity holders (27,701)                  
Net Impact on Accumulated deficit $ 9,231,616