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Prepaid Expenses and Other Assets (Details 2) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Mortgage and other investing receivables  
Mortgage and other investing receivables$ 35,830,000$ 18,870,000
Fair value of mortgage and other investing receivables36,000,00018,800,000
Mortgage loans receivable
  
Mortgage and other investing receivables  
Mortgage and other investing receivables21,065,00014,227,000
Number of mortgage loans receivable3 
Notes receivable from City of Huntsville
  
Mortgage and other investing receivables  
Mortgage and other investing receivables14,765,0004,643,000
Operating notes receivable
  
Operating Notes Receivable  
Operating notes receivables due from tenants with terms exceeding one year$ 628,000$ 655,000