Condensed Consolidated Income Statements - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Rental income	$ 45,246	$ 42,464
Independent living facilities	0	625
Interest and other income	505	1,251
Total revenues	45,751	44,340
Expenses:
Depreciation and amortization	13,473	13,160
Interest expense	5,762	6,714
Property taxes	696	485
Independent living facilities	0	546
General and administrative	5,142	4,054
Total expenses	25,073	24,959
Other loss:
Loss on sale of real estate	(192)	(56)
Net income	$ 20,486	$ 19,325
Earnings Per Share [Abstract]
Basic (in usd per share)	$ 0.21	$ 0.20
Diluted (in usd per share)	$ 0.21	$ 0.20
Weighted-average number of common shares:
Basic (in shares)	95,378	95,161
Diluted (in shares)	95,385	95,161
Independent living facilities, revenue services	us-gaap:HealthCareResidentServiceMember	us-gaap:HealthCareResidentServiceMember
Independent living facilities, cost of services	us-gaap:HealthCareResidentServiceMember	us-gaap:HealthCareResidentServiceMember