Variable Interest Entities (Summary Of Consoldiated Variable Interest Entities) (Details) (Consolidated Variable Interest Entities [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Maximum Risk of Loss	$ 128,473	[1]	$ 111,305	[1]
Assets held by VIEs	250,133		257,374
Assets held as collateral for debt	$ 241,803		$ 246,486

[1] The maximum risk of loss has been determined to be limited to our debt exposure for each real estate joint venture.