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Fair Value of Assets and Liabilities - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Assets:      
Cash and cash equivalents $ 126,497 $ 93,971 $ 110,916
Carrying Value      
Assets:      
Cash and cash equivalents 126,497 93,971  
Restricted cash and investments 35,725 65,896  
Liabilities:      
Borrowings under exchange and senior credit facility 906,712 906,712  
Fair Value      
Assets:      
Cash and cash equivalents 126,497 93,971  
Restricted cash and investments 35,725 65,896  
Liabilities:      
Borrowings under exchange and senior credit facility 932,328 926,445  
Level 1 | Fair Value      
Assets:      
Cash and cash equivalents 126,497 93,971  
Restricted cash and investments 35,725 65,896  
Level 2 | Fair Value      
Liabilities:      
Borrowings under exchange and senior credit facility 932,328 926,445  
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 286,521 286,521  
10.500% Public Second Lien Notes due 2028 | Fair Value      
Liabilities:      
Senior notes, fair value 292,726 293,049  
10.500% Public Second Lien Notes due 2028 | Level 2 | Fair Value      
Liabilities:      
Senior notes, fair value 292,726 293,049  
9.500% Private Second Lien Notes due 2028 | Carrying Value      
Liabilities:      
Senior notes, fair value 239,142 239,142  
9.500% Private Second Lien Notes due 2028 | Fair Value      
Liabilities:      
Senior notes, fair value 241,917 231,692  
9.500% Private Second Lien Notes due 2028 | Level 2 | Fair Value      
Liabilities:      
Senior notes, fair value 241,917 231,692  
6.00% Senior Notes due 2026 | Carrying Value      
Liabilities:      
Senior notes, fair value 110,858 110,858  
6.00% Senior Notes due 2026 | Fair Value      
Liabilities:      
Senior notes, fair value 109,268 106,541  
6.00% Senior Notes due 2026 | Level 2 | Fair Value      
Liabilities:      
Senior notes, fair value 109,268 106,541  
6.50% Exchangeable Senior Notes due 2026 | Carrying Value      
Liabilities:      
Senior notes, fair value 230,000 230,000  
6.50% Exchangeable Senior Notes due 2026 | Fair Value      
Liabilities:      
Senior notes, fair value 394,399 319,920  
6.50% Exchangeable Senior Notes due 2026 | Level 2 | Fair Value      
Liabilities:      
Senior notes, fair value $ 394,399 $ 319,920