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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 6 Months Ended
May 01, 2019
May 01, 2019
Jun. 30, 2019
Jun. 30, 2018
May 01, 2019
Jun. 30, 2019
Jun. 30, 2018
Reorganizations [Abstract]              
Gain on settlement of Liabilities subject to compromise $ 7,192,374 $ 7,192,379 $ 0 $ 0 $ 7,192,374 $ 0  
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)            
Reorganization items, net 7,082,213 $ 9,497,944 $ 0 $ (68,740) $ 9,461,826   $ (260,795)
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            
Compensation expense $ 1,500