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FRESH START ACCOUNTING (Summary of Reorganization Items) (Details) - USD ($)
$ in Thousands
5 Months Ended 7 Months Ended 12 Months Ended
May 31, 2018
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fresh Start Accounting [Abstract]            
Financial Designation, Predecessor and Successor [Fixed List] Predecessor Successor Successor Successor Predecessor Predecessor
Gain on settlement of liabilities subject to compromise $ 128,700          
Fresh start valuation adjustments (700,325)          
Payment of professional fees (13,345) $ (2,323)        
Other (2,355)          
Reorganization items, net $ (587,325) $ (2,323)