Condensed Consolidated Income Statements - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenues:
Rental income	$ 35,332			$ 29,404	$ 103,856	$ 85,254
Tenant reimbursements	2,990			2,543	8,974	7,253
Independent living facilities	871			825	2,515	2,407
Interest and other income	317			176	1,235	1,471
Total revenues	39,510			32,948	116,580	96,385
Expenses:
Depreciation and amortization	11,351			9,745	34,227	28,156
Interest expense	6,805			5,592	21,182	17,690
Loss on the extinguishment of debt	0			0	0	11,883
Property taxes	2,990			2,543	8,974	7,253
Independent living facilities	766			698	2,226	2,003
Impairment of real estate investment	0			0	0	890
General and administrative	3,088			3,059	9,638	8,426
Total expenses	25,000			21,637	76,247	76,301
Other income:
Gain on sale of real estate	0			0	2,051	0
Gain on disposition of other real estate investment	0			0	0	3,538
Net income	$ 14,510			$ 11,311	$ 42,384	$ 23,622	$ 25,874
Earnings per common share:
Basic (in usd per share)	$ 0.18			$ 0.15	$ 0.54	$ 0.33
Diluted (in usd per share)	$ 0.18			$ 0.15	$ 0.54	$ 0.33
Weighted-average number of common shares:
Basic (in shares)	81,490			75,471	77,811	71,693
Diluted (in shares)	81,490			75,471	77,811	71,693
Dividends declared per common share (in usd per share)	$ 0.205	$ 0.205	$ 0.205	$ 0.185	$ 0.615	$ 0.555	$ 0.74