Investment in Unconsolidated Ventures (Details 1) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Summary of results of operations of Real Estate Ventures
Company's share of income (Company's basis)	$ 418	$ 1,035	$ 2,739	$ 3,356
Unconsolidated real estate ventures [Member]
Summary of results of operations of Real Estate Ventures
Revenue	36,345	27,713	108,743	82,310
Operating expenses	15,863	9,766	46,407	28,767
Interest expense, net	10,326	8,928	31,999	25,936
Depreciation and amortization	9,869	8,336	28,836	22,860
Net (loss) income	287	683	1,501	4,747
Company's share of income (Company's basis)	$ 418	$ 1,035	$ 2,739	$ 3,356