Financial Instruments - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Carrying Amount	$ 931,141	$ 962,727
12.00% Second-Priority Senior Secured Notes - due January 2026
Debt Instrument [Line Items]
Carrying Amount	591,639	588,838
Fair Value	703,625	685,945
7.50% Senior Notes – due May 2022
Debt Instrument [Line Items]
Carrying Amount	6,060	6,060
Fair Value	5,696	6,145
Bank Credit Facility - matures November 2024
Debt Instrument [Line Items]
Carrying Amount	333,442	367,829
Fair Value	$ 340,000	$ 375,000