Financial Instruments - Restricted Cash (Details) - USD ($)		Jun. 30, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Restricted cash, current	[1]	$ 23,706,000	$ 28,657,000
Restricted cash, non-current	[1]	39,351,000	31,100,000
Total restricted cash		63,057,000	59,757,000
Consolidated Entity, Excluding VIEs
Variable Interest Entity [Line Items]
Restricted cash, current		21,858,000	25,740,000
Restricted cash, non-current		2,615,000	3,246,000
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Restricted cash, current		1,848,000	2,917,000
Restricted cash, non-current		36,736,000	$ 27,854,000
PPA II | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Restricted cash, non-current		$ 20,000,000.0

[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).