Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Customer agreements and incentives	$ 91,605	$ 58,111	$ 158,595	$ 107,201
Solar energy systems and product sales	78,933	72,511	156,306	128,530
Total revenue	170,538	130,622	314,901	235,731
Operating expenses:
Cost of customer agreements and incentives	57,769	45,289	112,345	87,902
Cost of solar energy systems and product sales	64,268	60,938	128,847	110,369
Sales and marketing	49,237	35,056	93,316	68,188
Research and development	5,052	3,710	8,948	6,706
General and administrative	28,130	25,228	61,023	49,836
Amortization of intangible assets	1,051	1,051	2,102	2,102
Total operating expenses	205,507	171,272	406,581	325,103
Loss from operations	(34,969)	(40,650)	(91,680)	(89,372)
Interest expense, net	31,872	21,971	60,070	42,529
Other expenses (income), net	508	208	(1,184)	683
Loss before income taxes	(67,349)	(62,829)	(150,566)	(132,584)
Income tax expense	4,378	10,781	12,581	16,181
Net loss	(71,727)	(73,610)	(163,147)	(148,765)
Net loss attributable to noncontrolling interests and redeemable noncontrolling interests	(79,136)	(91,956)	(198,588)	(176,993)
Net income available to common stockholders	$ 7,409	$ 18,346	$ 35,441	$ 28,228
Net income per share available to common stockholders
Basic (in dollars per share)	$ 0.07	$ 0.17	$ 0.33	$ 0.27
Diluted (in dollars per share)	$ 0.06	$ 0.17	$ 0.31	$ 0.26
Weighted average shares used to compute net income per share available to common stockholders
Basic (in shares)	109,559	105,093	108,510	104,568
Diluted (in shares)	117,067	107,347	113,930	106,911