Condensed Consolidated Income Statements - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenues:
Rental income	$ 34,708		$ 28,511	$ 68,524	$ 55,850
Tenant reimbursements	3,016		2,389	5,984	4,710
Independent living facilities	845		789	1,644	1,582
Interest and other income	400		1,140	918	1,295
Total revenues	38,969		32,829	77,070	63,437
Expenses:
Depreciation and amortization	11,299		9,335	22,876	18,411
Interest expense	7,285		6,219	14,377	12,098
Loss on the extinguishment of debt	0		11,883	0	11,883
Property taxes	3,016		2,389	5,984	4,710
Independent living facilities	744		644	1,460	1,305
Impairment of real estate investment	0		890	0	890
General and administrative	3,358		2,977	6,550	5,367
Total expenses	25,702		34,337	51,247	54,664
Other income:
Gain on sale of real estate	0		0	2,051	0
Gain on disposition of other real estate investment	0		3,538	0	3,538
Net income	$ 13,267		$ 2,030	$ 27,874	$ 12,311	$ 25,874
Earnings per common share:
Basic (in usd per share)	$ 0.17		$ 0.03	$ 0.36	$ 0.17
Diluted (in usd per share)	$ 0.17		$ 0.03	$ 0.36	$ 0.17
Weighted-average number of common shares:
Basic (in shares)	76,374		72,564	75,941	69,773
Diluted (in shares)	76,374		72,564	75,941	69,773
Dividends declared per common share (in usd per share)	$ 0.205	$ 0.205	$ 0.185	$ 0.41	$ 0.37	$ 0.74