Annual report pursuant to Section 13 and 15(d)

Properties, net (Details 2)

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Properties, net (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Properties    
Projects in development or held for future development $ 638,919 $ 642,682
Projects in development or held for future development | Land in development or held for future development
   
Properties    
Projects in development or held for future development 229,833 256,487
Projects in development or held for future development | Construction in progress, excluding land
   
Properties    
Projects in development or held for future development $ 409,086 $ 386,195