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Properties, net (Details 2) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Properties  
Properties under construction or development$ 696,914$ 642,682
Projects under construction or development | Land, development
  
Properties  
Properties under construction or development248,945256,487
Projects under construction or development | Construction in progress, excluding land
  
Properties  
Properties under construction or development$ 447,969$ 386,195