Power Purchase Agreement Programs - Schedule of PPA Entities' Assets and Liabilities (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	[1]	$ 308,009	$ 220,728
Restricted cash, current	[1]	23,706	28,657
Accounts receivable	[1]	38,296	84,887
Customer financing receivable	[1]	5,817	5,594
Total current assets		592,284	672,581
Property, plant and equipment, net	[1]	406,610	481,414
Non-current portion of investment in sales-type financing leases	[1]	64,146	67,082
Restricted cash, non-current	[1]	39,351	31,100
Other long-term assets	[1]	60,975	34,792
Total assets		1,222,579	1,389,668
Current liabilities:
Accounts payable	[1]	61,427	66,889
Accrued other current liabilities	[1]	109,722	69,535
Deferred Revenue And Customer Deposits, Current	[1]	129,321	94,158
Current portion of debt		26,224	29,848
Total current liabilities		339,087	279,666
Derivative liabilities	[1]	13,079	10,128
Deferred revenue and customer deposits	[1]	181,221	241,794
Long-term portion of debt		641,983	711,433
Other long-term liabilities	[1]	58,417	55,937
Total liabilities		1,233,787	1,298,958
Variable Interest Entity, Primary Beneficiary
Current assets:
Cash and cash equivalents		18,043	5,295
Restricted cash, current		1,848	2,917
Accounts receivable		6,533	7,516
Customer financing receivable		5,817	5,594
Prepaid expenses and other current assets		1,585	4,909
Total current assets		33,826	26,231
Property, plant and equipment, net		321,886	399,060
Non-current portion of investment in sales-type financing leases		64,146	67,082
Restricted cash, non-current		36,736	27,854
Other long-term assets		30,329	2,692
Total assets		486,923	522,919
Current liabilities:
Accounts payable		443	724
Accrued other current liabilities		39,028	1,442
Deferred Revenue And Customer Deposits, Current		786	786
Current portion of debt		10,544	21,162
Total current liabilities		50,801	24,114
Derivative liabilities		8,453	3,626
Deferred revenue and customer deposits		8,306	8,696
Long-term portion of debt		251,826	323,360
Other long-term liabilities		2,078	1,798
Total liabilities		$ 321,464	$ 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).