Summary of Significant Accounting Policies - Deferred Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 873,611	$ 799,276	$ 729,500
Deferred revenue, revenue recognized	86,300	80,300	69,400
Contracted but not yet recognized	$ 15,500,000
Revenue expected to recognize over next twelve months, percent	5.00%
Revenue recognized, term, existing deferred revenue	10 years
Initial lease term	22 years
Deferred revenue	$ 78,195	41,517	$ 138,422
Minimum
Deferred Revenue Arrangement [Line Items]
Initial lease term	20 years
Maximum
Deferred Revenue Arrangement [Line Items]
Initial lease term	25 years
Under Customer Agreements
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 703,956	666,741
Under Customer Agreements | Solar energy systems
Deferred Revenue Arrangement [Line Items]
Residential solar energy system, average age	5 years
Under Customer Agreements | Payments received
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 645,439	614,906
Under Customer Agreements | Financing component balance
Deferred Revenue Arrangement [Line Items]
Deferred revenue	58,517	51,835
Under SREC contracts
Deferred Revenue Arrangement [Line Items]
Deferred revenue	169,655	132,535
Under SREC contracts | Payments received
Deferred Revenue Arrangement [Line Items]
Deferred revenue	161,575	126,793
Under SREC contracts | Financing component balance
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 8,080	$ 5,742