Power Purchase Agreement Programs - Schedule of PPA Entities' Assets and Liabilities (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	[1]	$ 226,499	$ 220,728
Restricted cash, current	[1]	14,486	28,657
Accounts receivable	[1]	26,737	84,887
Customer financing receivable	[1]	5,919	5,594
Total current assets		490,359	672,581
Property, plant and equipment, net	[1]	384,377	481,414
Non-current portion of investment in sales-type financing leases	[1]	62,615	67,082
Restricted cash, non-current	[1]	116,890	31,100
Other long-term assets	[1]	58,400	34,792
Total assets		1,169,927	1,389,668
Current liabilities:
Accounts payable	[1]	81,060	66,889
Accrued other current liabilities	[1]	82,150	69,535
Deferred Revenue And Customer Deposits, Current	[1]	88,060	94,158
Current portion of debt		27,161	29,848
Total current liabilities		293,726	279,666
Derivative liabilities	[1]	14,648	10,128
Deferred revenue and customer deposits	[1]	179,712	241,794
Long-term portion of debt		636,808	711,433
Other long-term liabilities	[1]	56,117	55,937
Total liabilities		1,181,011	1,298,958
Variable Interest Entity, Primary Beneficiary
Current assets:
Cash and cash equivalents		4,960	5,295
Restricted cash, current		1,803	2,917
Accounts receivable		5,217	7,516
Customer financing receivable		5,919	5,594
Prepaid expenses and other current assets		5,178	4,909
Total current assets		23,077	26,231
Property, plant and equipment, net		300,939	399,060
Non-current portion of investment in sales-type financing leases		62,616	67,082
Restricted cash, non-current		114,213	27,854
Other long-term assets		29,589	2,692
Total assets		530,434	522,919
Current liabilities:
Accounts payable		393	724
Accrued other current liabilities		14,396	1,442
Deferred Revenue And Customer Deposits, Current		786	786
Current portion of debt		11,483	21,162
Total current liabilities		27,058	24,114
Derivative liabilities		10,654	3,626
Deferred revenue and customer deposits		8,108	8,696
Long-term portion of debt		249,115	323,360
Other long-term liabilities		2,216	1,798
Total liabilities		$ 297,151	$ 361,594

[1] We have variable interest entities which represent a portion of the consolidated balances are recorded within the "Cash and cash equivalents," "Restricted cash," "Accounts receivable," "Customer financing receivable," "Prepaid expenses and other current assets," "Property and equipment, net," "Customer financing receivable, non-current," "Restricted cash, non-current," "Other long-term assets," "Accounts payable," "Accrued other current liabilities," "Deferred revenue and customer deposits," "Current portion of non-recourse debt from related parties," "Derivative liabilities, net of current portion," "Deferred revenue and customer deposits, net of current portion," "Long-term portion of non-recourse debt," and "Other long-term liabilities" financial statement line items in the Condensed Consolidated Balance Sheets (see Note 12 - Power Purchase Agreement Programs).