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Pledged Assets and Debt - Senior Secured Notes Payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 12, 2018
Dec. 31, 2017
Senior secured notes payable      
Senior secure notes payable      
Deferred Issuance costs, noncurrent $ 0    
Predecessor      
Senior secure notes payable      
Net Principal, noncurrent     $ 248,126
Predecessor | 12.75% Senior Secured Notes due 2020      
Senior secure notes payable      
Face amount of debt $ 25,000    
Interest rate (as a percent) 12.75%    
Predecessor | Senior secured notes payable      
Senior secure notes payable      
Principal     249,790
Deferred issuance costs     1,664
Deferred Issuance costs, noncurrent     1,664
Net principal     248,126
Net Principal, noncurrent     248,126
Predecessor | Senior secured notes payable | 10.75% senior secured notes due 2019      
Senior secure notes payable      
Face amount of debt $ 405,000    
Interest rate (as a percent) 10.75%    
Principal     237,290
Deferred issuance costs     1,504
Net principal     $ 235,786
Predecessor | Senior secured notes payable | 12.75% Senior Secured Notes due 2020      
Senior secure notes payable      
Interest rate (as a percent)   12.75% 12.75%
Principal     $ 12,500
Deferred issuance costs     160
Net principal     $ 12,340