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Emergence from Chapter 11 Reorganization - Reorganizational Items (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended
Feb. 08, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Reorganizations [Abstract]          
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 $ 0 $ 0 $ 0