Fair Value of Financial Instruments - Schedule of Estimated Fair Value of Financial Instruments, by Balance Sheet Grouping (Parenthetical) (Details)						6 Months Ended	12 Months Ended
	May 19, 2021	Mar. 01, 2021	Feb. 09, 2021	Feb. 02, 2021	Jan. 28, 2021	Jun. 30, 2021	Dec. 31, 2020
Senior Notes | Senior Notes at 6.875%, Due 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument stated interest rate		6.875%					6.875%
Debt instrument maturity year		2022					2022
Senior Notes | Senior Notes at 6.875% Due 2028
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument stated interest rate						6.875%	6.875%
Debt instrument maturity year						2028	2028
Senior Secured Notes | Senior Secured Notes at 6.25%, Due 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument stated interest rate					6.25%		6.25%
Debt instrument maturity year					2023		2023
Senior Secured Notes | Senior Secured Notes at 8.625%, Due 2024
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument stated interest rate			8.625%				8.625%
Debt instrument maturity year			2024				2024
Senior Secured Notes | Senior Secured Notes at 6.625% Due 2025
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument stated interest rate						6.625%	6.625%
Debt instrument maturity year						2025	2025
Senior Secured Notes | Senior Secured Notes at 8%, Due 2026
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument stated interest rate						8.00%	8.00%
Debt instrument maturity year						2026	2026
Senior Secured Notes | Senior Secured Notes at 8% Due 2027
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument stated interest rate						8.00%	8.00%
Debt instrument maturity year						2027	2027
Senior Secured Notes | Senior Secured Notes at 5.625% due 2027
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument stated interest rate						5.625%	5.625%
Debt instrument maturity year						2027	2027
Senior Secured Notes | Senior Notes at 6% Due 2029
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument stated interest rate						6.00%	6.00%
Debt instrument maturity year						2029	2029
Senior Secured Notes | Senior Secured Notes at 4.750% due 2031
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument stated interest rate			4.75%			4.75%
Debt instrument maturity year			2031			2031
Junior-Priority Secured Notes | Junior-Priority Secured Notes at 9.875% Due 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument stated interest rate				9.875%			9.875%
Debt instrument maturity year				2023			2023
Junior-Priority Secured Notes | Junior-Priority Secured Notes at 8.125% Due 2024
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument stated interest rate							8.125%
Debt instrument maturity year							2024
Junior-Priority Secured Notes | Junior-Priority Secured Notes at 6.875% Due 2029
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument stated interest rate				6.875%		6.875%
Debt instrument maturity year				2029		2029
Junior-Priority Secured Notes | Junior-Priority Secured Notes at 6.125% Due 2030
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument stated interest rate	6.125%					6.125%
Debt instrument maturity year	2030					2030