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Net Investments in Properties (Tables)
9 Months Ended
Sep. 30, 2011
Net Investment In Properties [Abstract] 
Net Investments in Real Estate Properties
      
 September 30, 2011 December 31, 2010
Land$ 111,793 $ 111,660
Buildings  519,703   448,932
Less: Accumulated depreciation  (115,319)   (108,032)
 $ 516,177 $ 452,560
      
Net Investments in Operating Real Estate Properties
      
 September 30, 2011 December 31, 2010
Land$ 24,030 $ 24,030
Buildings   85,794   85,821
Less: Accumulated depreciation  (16,406)   (14,280)
 $ 93,418 $ 95,571