Mortgage and Other Notes Receivable (Schedule of Prior Year Schedule of Accounts, Notes, Loans and Financing Receivable) (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) numberOfProperty	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Real Estate Properties | numberOfProperty	198
Loans and Leases Receivable, Net Amount	$ 299,952,000	$ 292,427,000
Loans and Leases Receivable, Commitments, Fixed Rates	274,700,000
Prior Period Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net Amount	32,970,000
Loans and Leases Receivable, Commitments, Fixed Rates	50,400,000
Loans and Leases Receivable, Loans in Process	17,430,000
Timber Ridge OpCo [Member] | Prior Period Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net Amount	0
Loans and Leases Receivable, Commitments, Fixed Rates	5,000,000
Loans and Leases Receivable, Loans in Process	$ 5,000,000
Senior Living Communities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Real Estate Properties | numberOfProperty	10
Loans and Leases Receivable, Net Amount	$ 42,266,000
Senior Living Communities [Member] | Prior Period Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Commitments, Fixed Rates	32,700,000
Bickford Note Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net Amount	36,700,000
Loans and Leases Receivable, Commitments, Fixed Rates	$ 42,900,000
Bickford Senior Living [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Real Estate Properties | numberOfProperty	38
Loans and Leases Receivable, Net Amount	$ 40,599,000
Bickford Senior Living [Member] | Prior Period Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net Amount	4,000,000
Loans and Leases Receivable, Commitments, Fixed Rates	4,000,000
Loans and Leases Receivable, Loans in Process	$ 0