Properties And Equipment (Summary Of Investment And Development Property) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Investment and development properties, net	$ 114,024	$ 86,804
Land [Member]
Property, Plant and Equipment [Line Items]
Investment and development properties, net	24,446	24,371
Building [Member]
Property, Plant and Equipment [Line Items]
Investment and development properties, net	1,900	1,900
Construction-In-Progress (including capitalized interest) [Member]
Property, Plant and Equipment [Line Items]
Investment and development properties, net	$ 87,678	$ 60,533