Real Estate Investments - Mortgage Loans Activity (Details)	9 Months Ended
	Sep. 30, 2022 USD ($) a property item loan	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Mortgage Loans
Originations and funding under mortgage loans receivable	$ 35,234,000	$ 2,223,000
Application of interest reserve	4,348,000
Scheduled principal payments received	(625,000)	(625,000)
Mortgage loan premium amortization	(4,000)	(4,000)
Provision (recovery) for loan loss reserve	(389,000)	(16,000)
Net increase (decrease) in mortgage loans receivable	$ 38,564,000	1,578,000
Number of senior mortgage loans | loan	2
Number of beds/units | item	217
Area of land | a	7.6
Loan Term	4 years
Interest rate (as a percent)	7.25%
Internal Rate of Return	8.00%
Interest receivable	$ 44,290,000		$ 39,522,000
Write-off of accrued interest receivable	$ 0	$ 0
Maximum
Mortgage Loans
Loan Term	4 years
ALF
Mortgage Loans
Number of properties | property	2
Number of beds/units	74
California | ALF
Mortgage Loans
Number of properties | property	4