Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities:
Net loss	$ (142,530)	$ (102,385)
Adjustments to reconcile net loss to net cash used in operating activities:
Noncash losses	2,510	431
Depreciation and amortization, net of amortization of deferred grants	46,564	32,673
Bad debt expense	414	739
Interest on lease pass-through financing	6,019	7,177
Noncash tax expense (benefit)	3,210	(6,215)
Noncash interest expense	5,335	4,443
Stock-based compensation expense	8,647	6,421
Reduction in lease pass-through financing obligations	(9,491)	(10,379)
Changes in operating assets and liabilities:
Accounts receivable	3,884	(4,216)
Inventories	(16,839)	(13,890)
Prepaid and other assets	(2,760)	(8,615)
Accounts payable	(9,889)	22,751
Accrued expenses and other liabilities	3,218	6,209
Deferred revenue	3,295	20,254
Net cash used in operating activities	(98,413)	(44,602)
Investing activities:
Payments for the costs of solar energy systems, leased and to be leased	(332,472)	(257,806)
Purchases of property and equipment	(8,208)	(4,688)
Business acquisition, net of cash acquired	(5,000)	(14,575)
Net cash used in investing activities	(345,680)	(277,069)
Financing activities:
Proceeds from state tax credits, net of recapture	9,123	5,120
Proceeds from recourse debt	257,400	143,000
Repayment of recourse debt	(212,000)	(49,224)
Proceeds from non-recourse debt	189,746	10,200
Repayment of non-recourse debt	(16,543)	(5,732)
Payment of debt fees	(12,277)	(2,801)
Proceeds from lease pass-through financing obligations	12,805	52,034
Contributions received from noncontrolling interests and redeemable noncontrolling interests	239,621	155,662
Distributions paid to noncontrolling interests and redeemable noncontrolling interests	(18,257)	(13,717)
Proceeds from exercises of stock options, net of withholding taxes on restricted stock units and issuance of shares in connection with the Employee Stock Purchase Plan	3,616	2,387
Offering costs paid related to initial public offering	(437)	(4,722)
Payment of capital lease obligations	(6,416)	(1,472)
Change in restricted cash	1,068	(4,608)
Net cash provided by financing activities	447,449	286,127
Net increase (decrease) in cash	3,356	(35,544)
Cash, beginning of period	203,864	152,154
Cash, end of period	207,220	116,610
Supplemental disclosures of cash flow information
Cash paid for interest	10,676	3,118
Supplemental disclosures of noncash investing and financing activities
Costs of solar energy systems and property and equipment included in accounts payable and accrued expenses	15,586	4,777
Distributions payable to noncontrolling interests and redeemable noncontrolling interests	8,515	6,463
Vehicles acquired under capital leases	$ 10,914	5,255
Noncash purchase consideration on acquisition of business		$ 18,718