Property And Equipment (Summary Of Investment And Development Property) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Investment and development property	$ 74,119	$ 94,922
Land [Member]
Property, Plant and Equipment [Line Items]
Investment and development property	59,869	77,020
Construction-In-Progress (Including Capitalized Interest) [Member]
Property, Plant and Equipment [Line Items]
Investment and development property	$ 14,250	$ 17,902