Annual report pursuant to Section 13 and 15(d)

Prepaid Expenses and Other Assets (Details 2)

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Prepaid Expenses and Other Assets (Details 2) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Mortgage and other investing receivables    
Mortgage and other investing receivables $ 27,998,000 $ 18,870,000
Fair value of mortgage and other investing receivables 28,000,000 18,800,000
Notes receivable from City of Huntsville
   
Mortgage and other investing receivables    
Mortgage and other investing receivables 17,741,000 4,643,000
Mortgage loans receivable
   
Mortgage and other investing receivables    
Mortgage and other investing receivables 10,257,000 14,227,000
Number of mortgage loans receivable 2  
Operating notes receivable
   
Operating Notes Receivable    
Operating notes receivables due from tenants with terms exceeding one year $ 530,000 $ 655,000