Leases - Financial Obligations and Sublease Payments (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Finance Leases
2021	$ 95
2022	95
2023	90
2024	84
2025	28
Thereafter	0
Total minimum lease payments	392
Less: amounts representing interest or imputed interest	(51)
Present value of lease liabilities	341
Financing lease liabilities	(74)
Financing lease liabilities	267
PPA Entities
Finance Leases
2021	40,589
2022	41,584
2023	42,526
2024	40,429
2025	39,379
Thereafter	87,623
Total minimum lease payments	292,130
Less: amounts representing interest or imputed interest	(172,860)
Present value of lease liabilities	119,270
Financing lease liabilities	(12,745)
Financing lease liabilities	106,525
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2021	(40,589)
2022	(41,584)
2023	(42,526)
2024	(40,429)
2025	(39,379)
Thereafter	(87,623)
Total lease payments	$ (292,130)