Investment And Development Property (Summary Of Investment And Development Property) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Investment and development property, net	$ 94,922	$ 90,699
Land [Member]
Property, Plant and Equipment [Line Items]
Investment and development property, net	77,020	75,384
Construction-In-Progress (Including Capitalized Interest) [Member]
Property, Plant and Equipment [Line Items]
Investment and development property, net	$ 17,902	$ 15,315