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Long-Term Debt - Senior Unsecured Notes Debt Exchange (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]            
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]            
Debt Conversion, Original Debt, Amount 254,200,000          
Senior Notes | Senior Secured Note Due 2025 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 127,100,000 $ 0   $ 0   $ 127,073,000
Interest rate, stated percentage 8.00% 8.00%   8.00%   8.00%
Gain (loss) on extinguishment of debt       $ 22,200,000