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Long-Term Debt - Senior Secured Notes (Details) - USD ($)
3 Months Ended 6 Months Ended
May 22, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]            
Redemption price percentage       100.00%    
Gain (loss) on extinguishment of debt $ 143,400,000 $ (22,156,000) $ 143,443,000 $ (22,156,000) $ 143,443,000  
Senior Notes            
Debt Instrument [Line Items]            
Redemption price percentage       100.00%    
Percentage of principal amount, eligible to be redeemed       35.00%    
Senior Secured Note Due 2025 [Member] | Senior Notes            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 127,100,000 $ 0   $ 0   $ 127,073,000
Private placement price as percentage of par 83.44%          
Debt issuance costs $ 4,200,000          
Interest rate, stated percentage 8.00% 8.00%   8.00%   8.00%
Gain (loss) on extinguishment of debt       $ 22,200,000