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Borrowings - Schedule of Senior Notes (Footnote) (Details) - USD ($)
$ in Thousands
2 Months Ended 12 Months Ended
Aug. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Gain on repurchase of debt   $ 0 $ 5,099 $ 0
8.375% Senior Secured Notes Due In 2022        
Debt Instrument [Line Items]        
Debt instrument stated percentage of interest (percentage)   8.375%    
Senior Unsecured Notes        
Debt Instrument [Line Items]        
Redemption price (percentage)   100.00%    
Secured Debt | 8.375% Senior Secured Notes Due In 2022        
Debt Instrument [Line Items]        
Debt instrument, repurchased amount $ 39,400      
Debt instrument stated percentage of interest (percentage)   8.375%    
Debt instrument, repurchase price 34,300      
Gain on repurchase of debt $ 5,100