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Mortgage And Other Notes Receivable Mortgage and Other Notes Receivable (Schedule of Bickford Construction Loans) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Commitments, Fixed Rates $ 292,250,000  
Loans and Leases Receivable, Net Amount (340,143,000) $ (246,111,000)
Bickford Note Investment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Commitments, Fixed Rates 42,700,000  
Loans and Leases Receivable, Net Amount $ (37,116,000)  
January 2017 [Member] | Bickford Note Investment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Note Receivable Interest Rate 9.00%  
Loan Term 5 years  
Loans and Leases Receivable, Commitments, Fixed Rates $ 14,000,000  
Loans and Leases Receivable, Net Amount $ (14,000,000)  
January 2018 [Member] | Bickford Note Investment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Note Receivable Interest Rate 9.00%  
Loan Term 5 years  
Loans and Leases Receivable, Commitments, Fixed Rates $ 14,000,000  
Loans and Leases Receivable, Net Amount $ (11,804,000)  
July 2018 [Member] | Bickford Note Investment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Note Receivable Interest Rate 9.00%  
Loan Term 5 years  
Loans and Leases Receivable, Commitments, Fixed Rates $ 14,700,000  
Loans and Leases Receivable, Net Amount $ (11,312,000)