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Accounts Receivable, Net (Schedule Of Accounts Receivable) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
properties
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Revenue Bond Receivable $ 11,500 $ 14,718  
Straight-line rent receivable 73,332 62,605  
Total 98,369 93,693  
Impairment charges 27,283 10,195 $ 0
Tenants [Member]      
Accounts receivable, gross 15,057 19,923  
Non-Tenants [Member]      
Accounts receivable, gross 1,379 3,932  
Accounts Receivable [Member]      
Allowance for doubtful accounts (2,899) (7,485)  
Children's Learning Adventure USA, LLC [Member]      
Straight line rent write off   9,000  
Total   $ 6,000  
Allowance for Doubtful Accounts Receivable, Write-offs 7,200    
Impairment charges $ 16,500    
land held for development [Member] | Children's Learning Adventure USA, LLC [Member]      
number of properties in land held for development | properties 4