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Investments In Direct Financing Leases (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
properties
Dec. 31, 2017
USD ($)
Jul. 26, 2018
USD ($)
Initial direct costs   $ 300    
Investment in direct financing leases, net $ 0 20,558   $ 37,900
Impairment charges 2,206 27,283 $ 1,902  
gain on sale of investment in direct financing lease $ 0 $ 5,514 0  
Imagine Schools [Member]        
Number of public charter school properties | properties   2    
Allowance for lease losses     $ 7,300  
number of properties sold 2 4    
Proceeds from Sale of Finance Receivables   $ 43,400    
Number of properties subject to lease amendment     6  
Impairment charges     $ 9,600  
Tangible Asset Impairment Charges     2,300  
original acquisition cost   31,600    
gain on sale of investment in direct financing lease   $ 5,500    
Imagine Madison Avenue [Member] | Imagine Schools [Member]        
Tangible Asset Impairment Charges     600  
Discontinued Operations, Disposed of by Sale [Member] | Imagine Schools [Member]        
Impairment charges     $ 8,300