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Outstanding Loans and Security Agreements - Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Aug. 31, 2020	May 01, 2020
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 534,895	$ 539,669
Current portion of debt	30,291	25,831
Net Carrying Value, Long-Term	492,521	500,899
Total	522,812	526,730
10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Interest rate percentage				10.25%
Notes \| 10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Unpaid Principal Balance	70,000	70,000
Current portion of debt	12,355	8,348
Net Carrying Value, Long-Term	56,701	60,620
Total	$ 69,056	$ 68,968
Interest rate percentage	10.25%	10.25%
Senior Secured Notes \| 2.5% Green Convertible Senior Notes due August 2025
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 230,000	$ 230,000	$ 230,000
Current portion of debt	0	0
Net Carrying Value, Long-Term	223,355	222,863
Total	$ 223,355	$ 222,863
Interest rate percentage	2.50%	2.50%	2.50%
Senior Secured Notes \| 3.04% Senior Secured Notes due June 30, 2031
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 131,830	$ 134,644
Current portion of debt	9,404	9,376
Net Carrying Value, Long-Term	120,506	123,255
Total	$ 129,910	$ 132,631
Interest rate percentage	3.04%	3.04%
Senior Secured Notes \| 6.07% Senior Secured Notes due March 2030
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 72,852	$ 73,955
Current portion of debt	4,879	4,671
Net Carrying Value, Long-Term	67,314	68,591
Total	$ 72,193	$ 73,262
Interest rate percentage	6.07%	6.07%
Recourse Debt
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 300,000	$ 300,000
Current portion of debt	12,355	8,348
Net Carrying Value, Long-Term	280,056	283,483
Total	292,411	291,831
Term Loan \| 7.5% Term Loan due September 2028
Debt Instrument [Line Items]
Unpaid Principal Balance	30,213	31,070
Current portion of debt	3,653	3,436
Net Carrying Value, Long-Term	24,645	25,570
Total	$ 28,298	$ 29,006
Interest rate percentage	7.50%	7.50%
Non-recourse Debt
Debt Instrument [Line Items]
Unpaid Principal Balance	$ 234,895	$ 239,669
Current portion of debt	17,936	17,483
Net Carrying Value, Long-Term	212,465	217,416
Total	$ 230,401	$ 234,899