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Debt - 12.875% Senior Secured Notes Due 2026 (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 14, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]            
Debt extinguishment and commitment costs   $ 6,628,000 $ 0 $ 8,135,000 $ 0  
Principal amount of long-term debt   $ 588,125,000   $ 588,125,000   $ 731,523,000
12.875% Senior Secured Notes due 2026            
Debt Instrument [Line Items]            
Debt instrument, interest rate (in percent)   12.875%   12.875%   12.875%
Senior Notes | 12.875% Senior Secured Notes due 2026            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 36,800,000          
Debt instrument, interest rate (in percent)   12.875%   12.875%    
Redemption price, percentage 112.875%          
Loss on repurchase of debt instrument   $ 4,700,000   $ 4,700,000    
Debt extinguishment and commitment costs   1,900,000   1,900,000    
Principal amount of long-term debt   $ 68,250,000   $ 68,250,000   $ 105,000,000