Fair Value of Assets and Liabilities - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Assets:
Cash and cash equivalents	$ 70,635	$ 93,971	$ 141,020
Carrying Value
Assets:
Cash and cash equivalents	70,635	93,971
Restricted cash and investments	35,944	65,896
Liabilities:
Borrowings under exchange and senior credit facility	413,750	906,712
Fair Value
Assets:
Cash and cash equivalents	70,635	93,971
Restricted cash and investments	35,944	65,896
Liabilities:
Borrowings under exchange and senior credit facility	420,526	926,445
Level 1 | Fair Value
Assets:
Cash and cash equivalents	70,635	93,971
Restricted cash and investments	35,944	65,896
Level 2 | Fair Value
Liabilities:
Borrowings under exchange and senior credit facility	420,526	926,445
5.875% Senior Notes due 2024 | Carrying Value
Liabilities:
Senior notes, fair value		23,253
5.875% Senior Notes due 2024 | Fair Value
Liabilities:
Senior notes, fair value		22,946
5.875% Senior Notes due 2024 | Level 2 | Fair Value
Liabilities:
Senior notes, fair value		22,946
10.500% Public Second Lien Notes due 2028 | Carrying Value
Liabilities:
Senior notes, fair value		286,521
10.500% Public Second Lien Notes due 2028 | Fair Value
Liabilities:
Senior notes, fair value		293,049
10.500% Public Second Lien Notes due 2028 | Level 2 | Fair Value
Liabilities:
Senior notes, fair value		293,049
10.250% Senior Notes due 2031 | Carrying Value
Liabilities:
Senior notes, fair value	625,000
10.250% Senior Notes due 2031 | Fair Value
Liabilities:
Senior notes, fair value	667,388
10.250% Senior Notes due 2031 | Level 2 | Fair Value
Liabilities:
Senior notes, fair value	667,388
9.500% Private Second Lien Notes due 2028 | Carrying Value
Liabilities:
Senior notes, fair value		239,142
9.500% Private Second Lien Notes due 2028 | Fair Value
Liabilities:
Senior notes, fair value		231,692
9.500% Private Second Lien Notes due 2028 | Level 2 | Fair Value
Liabilities:
Senior notes, fair value		231,692
6.00% Senior Notes due 2026 | Carrying Value
Liabilities:
Senior notes, fair value		110,858
6.00% Senior Notes due 2026 | Fair Value
Liabilities:
Senior notes, fair value		106,541
6.00% Senior Notes due 2026 | Level 2 | Fair Value
Liabilities:
Senior notes, fair value		106,541
8.625% Senior Secured Notes Due 2029 | Carrying Value
Liabilities:
Senior notes, fair value	650,000
8.625% Senior Secured Notes Due 2029 | Fair Value
Liabilities:
Senior notes, fair value	676,358
8.625% Senior Secured Notes Due 2029 | Level 2 | Fair Value
Liabilities:
Senior notes, fair value	676,358
6.50% Exchangeable Senior Notes due 2026 | Carrying Value
Liabilities:
Senior notes, fair value	300	230,000
6.50% Exchangeable Senior Notes due 2026 | Fair Value
Liabilities:
Senior notes, fair value	477	319,920
6.50% Exchangeable Senior Notes due 2026 | Level 2 | Fair Value
Liabilities:
Senior notes, fair value	$ 477	$ 319,920