Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Net loss	$ (86,906)	$ (91,420)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization, net of amortization of deferred grants	43,661	36,186
Deferred income taxes	(3,361)	8,203
Stock-based compensation expense	5,783	10,694
Interest on pass-through financing obligations	6,472	3,099
Reduction in pass-through financing obligations	(9,986)	(5,028)
Other noncash losses and expenses	1,489	5,667
Changes in operating assets and liabilities:
Accounts receivable	(147)	6,217
Inventories	3,283	6,525
Prepaid and other assets	(35,868)	(13,323)
Accounts payable	(22,577)	(12,982)
Accrued expenses and other liabilities	7,724	(7,048)
Deferred revenue	101,848	7,456
Net cash provided by (used in) operating activities	11,415	(45,754)
Investing activities:
Payments for the costs of solar energy systems	(198,880)	(163,190)
Purchases of property and equipment	(2,517)	(1,521)
Net cash used in investing activities	(201,397)	(164,711)
Financing activities:
Proceeds from state tax credits, net of recapture	2,604	(49)
Payment of debt fees	(2,654)	(3,880)
Proceeds from pass-through financing and other obligations	1,785	1,502
Early repayment of pass-through financing obligation	(7,597)	0
Payment of finance lease obligations	(3,001)	(2,113)
Contributions received from noncontrolling interests and redeemable noncontrolling interests	152,149	143,604
Distributions paid to noncontrolling interests and redeemable noncontrolling interests	(18,447)	(15,263)
Acquisition of noncontrolling interest	(4,600)	0
Proceeds from exercises of stock options, net of withholding taxes paid on restricted stock units	839	(576)
Net cash provided by financing activities	195,517	212,003
Net change in cash and restricted cash	5,535	1,538
Cash and restricted cash, beginning of period	304,399	241,790
Cash and restricted cash, end of period	309,934	243,328
Supplemental disclosures of cash flow information
Cash paid for interest	20,058	16,446
Cash paid for taxes	0	0
Supplemental disclosures of noncash investing and financing activities
Purchases of solar energy systems and property and equipment included in accounts payable and accrued expenses	24,303	17,233
Right-of-use assets obtained in exchange for new finance lease liabilities	3,543	99
Recourse debt
Financing activities:
Proceeds from issuance of debt	40,000	2,000
Repayment of debt	(47,965)	(2,000)
Non-recourse debt
Financing activities:
Proceeds from issuance of debt	181,652	95,900
Repayment of debt	$ (99,248)	$ (7,122)