Financial Instruments - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Carrying Amount	$ 962,727	$ 985,512
12.00% Second-Priority Senior Secured Notes
Debt Instrument [Line Items]
Carrying Amount	588,838
Fair Value	685,945
11.00% Second-Priority Senior Secured Notes – due April 2022
Debt Instrument [Line Items]
Carrying Amount		343,579
Fair Value		355,935
7.50% Senior Notes – due May 2022
Debt Instrument [Line Items]
Carrying Amount	6,060	6,060
Fair Value	6,145	5,238
Bank Credit Facility - matures November 2024
Debt Instrument [Line Items]
Carrying Amount	367,829	635,873
Fair Value	$ 375,000	$ 640,000