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Basis of Presentation - Narrative (Details) - 8.00% senior secured notes due in 2025
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Stated interest rate 8.00%  
8.00% Senior Secured Notes Due 2025    
Debt Instrument [Line Items]    
Stated interest rate 8.00% 8.00%