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Debt (Chapter 11 Proceedings, Emergence and Successor Debt) (Details) - USD ($)
$ in Thousands
1 Months Ended
Mar. 21, 2017
Nov. 30, 2017
Exit Revolver    
Debt Instrument [Line Items]    
Amount of repayments on prior credit facility   $ 10,900
Plan of Reorganization | Prior Credit Facility    
Debt Instrument [Line Items]    
Amount of repayments on prior credit facility $ 444,440  
Plan of Reorganization | Exit Revolver    
Debt Instrument [Line Items]    
New credit facility, opening balance 120,000  
Plan of Reorganization | Exit Term Loan    
Debt Instrument [Line Items]    
New credit facility, opening balance $ 150,000