Property And Equipment (Summary Of Investment And Development Property) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Investment and development property	$ 9,728	$ 11,570
Land [Member]
Property, Plant and Equipment [Line Items]
Investment and development property	4,249	5,936
Construction-In-Progress (Including Capitalized Interest) [Member]
Property, Plant and Equipment [Line Items]
Investment and development property	$ 5,479	$ 5,634