CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Revenues:
Rental income from operating leases	$ 124,868	$ 101,125		$ 49,305
Resident fees and services	232,363	183,407		123,777
Tenant reimbursement income	19,824	15,993		7,504
Interest income on note receivable from related party				498
Total revenues	377,055	300,525		181,084
Operating expenses:
Property operating expenses	184,632	149,688		93,549
General and administrative	12,847	10,088		6,877
Acquisition fees and expenses	974	21,526		23,931
Asset management fees	25,443	17,892		8,481
Property management fees	18,532	14,759		8,942
Contingent purchase price consideration adjustment	(290)	(589)		(630)
Impairment provision		4,661
Loss on lease terminations	785	863
Depreciation and amortization	122,985	105,945		63,112
Total operating expenses	365,908	324,833		204,262
Operating income (loss)	11,147	(24,308)		(23,178)
Other income (expense):
Interest and other income	64	158		104
Interest expense and loan cost amortization	(58,317)	(42,969)		(30,487)
Equity in earnings (loss) of unconsolidated entities	258	(596)		(1,387)
Gain on purchase of controlling interest of investment in unconsolidated entity				2,798
Total other expense	(57,995)	(43,407)		(28,972)
Income tax expense	(351)	(378)		(361)
Loss before gain on sale of real estate	(47,199)	(68,093)		(52,511)
Gain on sale of real estate	15,415
Net loss	(31,784)	(68,093)		(52,511)
Less: Net loss attributable to noncontrolling interest	(117)	(38)
Net loss attributable to common stockholders	$ (31,667)	$ (68,055)		$ (52,511)
Net loss per share of common stock (basic and diluted)	$ (0.18)	$ (0.44)		$ (0.61)
Weighted average number of shares of common stock outstanding (basic and diluted)	175,121	153,804	[1]	85,710
Distributions declared per share of common stock	$ 0.4232	$ 0.4232		$ 0.4071

[1] For the purposes of determining the weighted average number of shares of common stock outstanding, stock distributions issued are treated as if they were outstanding for all periods presented.