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Properties And Equipment (Summary Of Investment And Development Property) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Investment and development property $ 11,570 $ 114,024
Land [Member]    
Property, Plant and Equipment [Line Items]    
Investment and development property 5,936 24,446
Building [Member]    
Property, Plant and Equipment [Line Items]    
Investment and development property   1,900
Construction-In-Progress (Including Capitalized Interest) [Member]    
Property, Plant and Equipment [Line Items]    
Investment and development property $ 5,634 $ 87,678