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Mortgage and Other Notes Receivable (Schedule of New Investments) (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
numberOfProperty
numberOfBedOrUnitInTheProperty
Dec. 31, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Real Estate Properties | numberOfProperty 198  
Loans and Leases Receivable, Commitments, Fixed Rates $ 274,700,000  
Loans and Leases Receivable, Net Amount $ (299,952,000) $ (292,427,000)
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)  
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 Note Investment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Commitments, Fixed Rates 42,900,000  
Loans and Leases Receivable, Net Amount $ (36,700,000)  
Current Period Investment [Member] | 41 Management [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Real Estate Properties | numberOfBedOrUnitInTheProperty 1  
Current Period Investment [Member] | Timber Ridge OpCo [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Real Estate Properties | numberOfBedOrUnitInTheProperty 1  
Current Period Investment [Member] | Bickford Senior Living [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Real Estate Properties | numberOfBedOrUnitInTheProperty 2  
Current Period Investment [Member] | Bickford Senior Living [Member] | June 2020    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Real Estate Properties | numberOfBedOrUnitInTheProperty 1  
Current Period Investment [Member] | Watermark Retirement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Real Estate Properties | numberOfBedOrUnitInTheProperty 2  
Prior Period Real Estate Acquisition | Bickford Senior Living [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Real Estate Properties | numberOfBedOrUnitInTheProperty 1  
June 2020 | Bickford Note Investment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net Amount $ (7,955,000)  
Prior Period Investment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Commitments, Fixed Rates 50,400,000  
Loans and Leases Receivable, Net Amount (32,970,000)  
Loans and Leases Receivable, Loans in Process 17,430,000  
Prior Period Investment [Member] | Senior Living Communities [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Commitments, Fixed Rates 32,700,000  
Prior Period Investment [Member] | Timber Ridge OpCo [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Commitments, Fixed Rates 5,000,000  
Loans and Leases Receivable, Net Amount 0  
Loans and Leases Receivable, Loans in Process 5,000,000  
Prior Period Investment [Member] | Bickford Senior Living [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Commitments, Fixed Rates 4,000,000  
Loans and Leases Receivable, Net Amount (4,000,000)  
Loans and Leases Receivable, Loans in Process 0  
Prior Period Investment [Member] | Bickford Senior Living [Member] | June 2020    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Loans in Process 6,245,000  
Prior Period Investment [Member] | Watermark Retirement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Commitments, Fixed Rates 5,000,000  
Loans and Leases Receivable, Net Amount (3,307,000)  
Loans and Leases Receivable, Loans in Process 1,693,000  
Prior Period Investment [Member] | Bickford Note Investment [Member] | June 2020    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Commitments, Fixed Rates 14,200,000  
Prior Period Investment [Member] | 41 Management Sussex    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Commitments, Fixed Rates 22,200,000  
Loans and Leases Receivable, Net Amount (17,708,000)  
Loans and Leases Receivable, Loans in Process $ 4,492,000