Properties And Equipments (Summary Of Investment And Development Property) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Investment and development properties, net	$ 86,804	$ 61,254
Land [Member]
Property, Plant and Equipment [Line Items]
Investment and development properties, net	24,371	25,025
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	$ 60,533	$ 34,329