Investment in Unconsolidated Ventures Investment in Unconsolidated Ventures (Summary of Results of Operations of Unconsolidated Ventures) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule of Equity Method Investments [Line Items]
Company's share of income (Company's basis)	$ 1,508	$ 838	$ 3,043	$ 882
Unconsolidated Real Estate Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Revenue	36,927	39,064	77,816	77,872
Operating expenses	17,205	16,349	35,472	33,066
Interest expense, net	9,173	9,975	18,944	20,867
Depreciation and amortization	10,979	11,649	23,885	23,120
Net income (loss)	(430)	1,091	(485)	819
Company's share of income (Company's basis)	$ 1,508	$ 838	$ 3,043	$ 882