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Equity Investment in Real Estate and the Managed REITs (Details 4) (Managed REITs, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Managed REITs
   
Equity Method Investment Summarized Financial Information Income Statement    
Revenues $ 178,685 $ 212,890
Expenses (171,253) (175,440)
Net Income from continuing operations 7,432 37,450
Net income attributable to the equity investments in real estate and REITs $ 10,352 $ 33,197