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Investments In Direct Financing Leases (Narrative) (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
properties
years
Dec. 31, 2017
USD ($)
properties
Dec. 31, 2016
USD ($)
Jul. 26, 2018
USD ($)
Jan. 02, 2018
properties
Initial direct costs $ 300,000 $ 800,000      
Allowance for lease losses     $ 0    
Investment in direct financing leases, net 20,558,000 57,903,000   $ 37,900,000  
Proceeds from Sale of Lease Receivables 43,447,000 0 $ 20,951,000    
Mortgage Notes and Related Accrued Interest Receivable, Net 517,467,000 970,749,000      
number of properties sold     9    
Net Investment in Direct Financing and Sales Type Leases, Carrying Value of Investments Sold     $ 91,300,000    
Number of properties securing debt | properties         1
Impairment charges 27,283,000 10,195,000 0    
gain on sale of investment in direct financing lease $ 5,514,000 $ 0 0    
Minimum [Member]          
Length of lease (in years) | years 13        
Maximum [Member]          
Length of lease (in years) | years 14        
Imagine Schools [Member]          
Number of public charter school properties | properties 2 6      
Allowance for lease losses   $ 7,300,000      
Mortgage Notes and Related Accrued Interest Receivable, Net $ 54,500,000   $ 70,300,000    
number of properties sold 4 13 7    
Proceeds from Sale of Finance Receivables $ 43,400,000        
Number of properties subject to lease amendment   6      
Impairment charges   $ 9,600,000      
Tangible Asset Impairment Charges   2,300,000      
original acquisition cost 31,600,000        
gain on sale of investment in direct financing lease $ 5,500,000        
Third Parties [Member]          
number of properties sold     2    
Imagine Madison Avenue [Member] | Imagine Schools [Member]          
Tangible Asset Impairment Charges   $ 600,000      
Education Property [Member]          
number of properties sold   3      
Corporation [Member] | Education Property [Member] | Mortgage Receivable [Member]          
Number of properties securing debt 4        
Mortgage Note, 7.00% due December 20, 2021 [Member] | Corporation [Member] | Education Property [Member] | Mortgage Receivable [Member]          
Mortgage Notes and Related Accrued Interest Receivable, Net $ 54,535,000 $ 57,890,000      
Number of properties securing debt 8