Variable Interest Entities (Summary Of Unconsolidated Variable Interest Entities) (Details) (Unconsolidated Variable Interest Entities [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011
Unconsolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Investment in Real Estate Joint Ventures and Partnerships, net	$ 30,429	[1]	$ 30,377	[1]
Maximum Risk of Loss	$ 33,776	[2]	$ 75,274	[2]

[1] The carrying amount of the investments represents our contributions to the real estate joint ventures net of any distributions made and our portion of the equity in earnings of the joint ventures.

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