Long-Term Debt - Schedule of Debt (Parenthetical) (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Feb. 06, 2020
Senior Secured Notes | Senior Secured Notes at 5.125%, Due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.125%	5.125%
Debt instrument, maturity year	2021	2021
Senior Secured Notes | Senior Secured Notes at 6.25%, Due 2023
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.25%	6.25%
Debt instrument, maturity year	2023	2023
Senior Secured Notes | Senior Secured Notes at 8.625%, Due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	8.625%	8.625%
Debt instrument, maturity year	2024	2024
Senior Secured Notes | Senior Secured Notes at 6.625% Due 2025
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.625%	6.625%	6.625%
Debt instrument, maturity year	2025	2025
Senior Secured Notes | Senior Secured Notes at 8%, Due 2026
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	8.00%	8.00%
Debt instrument, maturity year	2026	2026
Senior Secured Notes | Senior Secured Notes at 8% Due 2027
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	8.00%	8.00%
Debt instrument, maturity year	2027	2027
Senior Notes | Senior Notes at 6.875%, Due 2022
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.875%	6.875%
Debt instrument, maturity year	2022	2022
Senior Notes | Senior Notes at 6.875% Due 2028
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.875%	6.875%
Debt instrument, maturity year	2028	2028
Junior-Priority Secured Notes | Junior-Priority Secured Notes at 9.875% Due 2023
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	9.875%	9.875%
Debt instrument, maturity year	2023	2023
Junior-Priority Secured Notes | Junior-Priority Secured Notes at 8.125% Due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	8.125%	8.125%
Debt instrument, maturity year	2024	2024