Fair Value of Assets and Liabilities - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Assets:
Cash and cash equivalents	$ 91,645	$ 506,491	$ 537,070
Carrying Value
Assets:
Cash and cash equivalents	91,645	506,491
Restricted cash and investments	29,728	41,831
Liabilities:
Borrowings under exchange and senior credit facility	1,143,977	1,546,895
Carrying Value | Non-recourse debt
Liabilities:
Non-recourse debt		310,108
Fair Value
Assets:
Cash and cash equivalents	91,645	506,491
Restricted cash and investments	29,728	41,831
Liabilities:
Borrowings under exchange and senior credit facility	1,161,385	1,448,280
Level 1 | Fair Value
Assets:
Cash and cash equivalents	91,645	506,491
Restricted cash and investments	29,728	41,831
Level 2 | Fair Value
Liabilities:
Borrowings under exchange and senior credit facility	1,161,385	1,448,280
Level 2 | Fair Value | Non-recourse debt
Liabilities:
Non-recourse debt		310,108
5.125% Senior Notes due 2023
Liabilities:
Non-recourse debt	125,700
5.125% Senior Notes due 2023 | Carrying Value
Liabilities:
Senior notes, fair value		259,275
5.125% Senior Notes due 2023 | Fair Value
Liabilities:
Senior notes, fair value		248,479
5.125% Senior Notes due 2023 | Level 2 | Fair Value
Liabilities:
Senior notes, fair value		248,479
5.875% Senior Notes due 2024
Liabilities:
Non-recourse debt	23,300
5.875% Senior Notes due 2024 | Carrying Value
Liabilities:
Senior notes, fair value	23,253	225,293
5.875% Senior Notes due 2024 | Fair Value
Liabilities:
Senior notes, fair value	22,197	199,522
5.875% Senior Notes due 2024 | Level 2 | Fair Value
Liabilities:
Senior notes, fair value	22,197	199,522
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	283,882
10.500% Public Second Lien Notes due 2028 | Level 2 | Fair Value
Liabilities:
Senior notes, fair value	283,882
9.500% Private Second Lien Notes due 2028
Liabilities:
Senior notes, fair value	239,142
9.500% Private Second Lien Notes due 2028 | Fair Value
Liabilities:
Senior notes, fair value	222,856
9.500% Private Second Lien Notes due 2028 | Level 2 | Fair Value
Liabilities:
Senior notes, fair value	222,856
6.00% Senior Notes due 2026
Liabilities:
Senior notes, fair value	215,700
Non-recourse debt	110,900
6.00% Senior Notes due 2026 | Carrying Value
Liabilities:
Senior notes, fair value	110,858	350,000
6.00% Senior Notes due 2026 | Fair Value
Liabilities:
Senior notes, fair value	90,945	283,691
6.00% Senior Notes due 2026 | Level 2 | Fair Value
Liabilities:
Senior notes, fair value	90,945	283,691
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	246,392	248,211
6.50% Exchangeable Senior Notes due 2026 | Level 2 | Fair Value
Liabilities:
Senior notes, fair value	$ 246,392	$ 248,211