Interim Financial Statements (Summary of Property Acquisitions And Investments In Unconsolidated Real Estate Joint Ventures) (Details) (Acquisitions And Investments In Real Estate Joint Ventures [Member], USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Acquisitions And Investments In Real Estate Joint Ventures [Member]
Interim Financial Statements [Line Items]
Increase in debt	$ 24,383
Decrease in property	3,812	1,666
Decrease in real estate joint ventures and partnerships - investments	153
Increase in other, net	$ 22	$ 130