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Debt - Summary of Detail Comprising Debt and Related Book Values (Parenthetical) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Jan. 14, 2021
11.00% Second-Priority Senior Secured Notes – due April 2022      
Debt Instrument [Line Items]      
Debt instrument interest rate 11.00% 11.00%  
Senior notes, maturity date Apr. 03, 2022 Apr. 03, 2022  
7.50% Senior Notes – due May 2022      
Debt Instrument [Line Items]      
Debt instrument interest rate 7.50% 7.50%  
Senior notes, maturity date May 31, 2022 May 31, 2022  
Bank Credit Facility – matures May 2022      
Debt Instrument [Line Items]      
Senior notes, maturity date May 10, 2022    
Senior Notes | 12.00% Second-Priority Senior Secured Notes – due January 2026      
Debt Instrument [Line Items]      
Debt instrument interest rate 12.00%   12.00%
Senior notes, maturity date Jan. 15, 2026    
Senior Notes | 11.00% Second-Priority Senior Secured Notes – due April 2022      
Debt Instrument [Line Items]      
Debt instrument interest rate 11.00%    
Senior notes, maturity date Apr. 03, 2022    
Senior Notes | 7.50% Senior Notes – due May 2022      
Debt Instrument [Line Items]      
Debt instrument interest rate 7.50%    
Senior notes, maturity date May 31, 2022    
Bank Credit Facility | Bank Credit Facility – matures May 2022      
Debt Instrument [Line Items]      
Senior notes, maturity date May 10, 2022