Financial Instruments - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Carrying Amount	$ 788,468	$ 962,727
12.00% Second-Priority Senior Secured Notes - due January 2026
Debt Instrument [Line Items]
Carrying Amount	594,549	588,838
Fair Value	679,452	685,945
7.50% Senior Notes – due May 2022
Debt Instrument [Line Items]
Carrying Amount	0	6,060
Fair Value	0	6,145
Bank Credit Facility - matures November 2024
Debt Instrument [Line Items]
Carrying Amount	193,919	367,829
Fair Value	$ 200,000	$ 375,000