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Emergence from Chapter 11 Reorganization - Reorganizational Items (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended
Feb. 08, 2019
Mar. 31, 2019
Mar. 31, 2018
Reorganization Items [Line Items]      
Total reorganization items, net   $ 0  
Predecessor      
Reorganization Items [Line Items]      
Gain on settlement of liabilities subject to compromise $ 168,952    
Fresh start adjustments 102,830    
Reorganization professional fees and other expenses (5,398)    
Write-off of deferred financing costs (370)    
Other reorganization items, net (3,213)    
Total reorganization items, net $ 262,801   $ 0