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FRESH START ACCOUNTING - Reorganization Items (Details) - USD ($)
$ in Thousands
2 Months Ended 4 Months Ended 6 Months Ended
Feb. 28, 2017
Jun. 30, 2017
Jun. 30, 2016
Fresh-Start Adjustment [Line Items]      
Gain on reorganization items, net   $ 0  
Predecessor      
Fresh-Start Adjustment [Line Items]      
Gain on settlement of liabilities subject to compromise $ 230,554    
Fresh start valuation adjustments 235,804    
Reorganization professional fees and other expenses (20,512)    
Write-off of deferred financing costs (2,577)    
Other reorganization items (5,525)    
Gain on reorganization items, net $ 437,744   $ 0