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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 11 Months Ended 12 Months Ended
Feb. 08, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitment And Contingencies [Line Items]        
Rent expense   $ 7,800    
Contractual Obligation   100    
General and administrative   114,735    
Predecessor        
Commitment And Contingencies [Line Items]        
Rent expense $ 100   $ 7,800 $ 3,600
General and administrative $ 21,234   $ 55,671 $ 40,468
Performance Shares        
Commitment And Contingencies [Line Items]        
General and administrative   $ 10,900