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Long-Term Debt - Senior Notes (Details) - Senior Notes
6 Months Ended
May 22, 2020
Mar. 15, 2019
Jun. 30, 2021
Debt Instrument [Line Items]      
Percentage of principal amount, event of default     25.00%
Senior Notes Due 2026      
Debt Instrument [Line Items]      
Percentage of principal amount, change in control   101.00%  
Senior Secured Note Due 2025 [Member]      
Debt Instrument [Line Items]      
Percentage of principal amount, change in control 101.00%    
Senior Notes Due 2027      
Debt Instrument [Line Items]      
Percentage of principal amount, change in control   101.00%