Equity Investments in Real Estate (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Equity Method Investment Summarized Financial Information Income Statement
Revenues	$ 111,151	$ 82,072	$ 15,961
Expenses	(80,237)	(63,267)	(12,874)
Net Income from continuing operations	30,914	18,805	3,087
Net income attributable to equity method investments	$ 30,914	$ 18,805	$ 3,087