Consolidated Income Statements - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Rental income	$ 190,195,000	$ 173,612,000	$ 155,667,000
Independent living facilities	0	2,077,000	3,389,000
Interest and other income	2,156,000	2,643,000	4,345,000
Total revenues	192,351,000	178,332,000	163,401,000
Expenses:
Depreciation and amortization	55,340,000	52,760,000	51,822,000
Interest expense	23,677,000	23,661,000	28,125,000
Property taxes	3,574,000	2,836,000	3,048,000
Independent living facilities	0	1,869,000	2,898,000
Impairment of real estate investments	0	0	16,692,000
Provision for loan losses	0	0	1,076,000
General and administrative	26,874,000	16,302,000	15,158,000
Total expenses	109,465,000	97,428,000	118,819,000
Other (loss) income:
Loss on extinguishment of debt	(10,827,000)	0	0
(Loss) gain on sale of real estate	(77,000)	(37,000)	1,777,000
Total other (loss) income	(10,904,000)	(37,000)	1,777,000
Net income	$ 71,982,000	$ 80,867,000	$ 46,359,000
Earnings per common share:
Basic (usd per share)	$ 0.74	$ 0.85	$ 0.49
Diluted (usd per share)	$ 0.74	$ 0.85	$ 0.49
Weighted-average number of common shares:
Basic (shares)	96,017,000	95,200,000	93,088,000
Diluted (shares)	96,092,000	95,207,000	93,098,000
Independent living facilities, revenue services	Health Care, Resident Service [Member]	Health Care, Resident Service [Member]	Health Care, Resident Service [Member]
Independent living facilities, cost of services	Health Care, Resident Service [Member]	Health Care, Resident Service [Member]	Health Care, Resident Service [Member]