Quarterly report pursuant to Section 13 or 15(d)

Prepaid Expenses and Other Assets (Details 2)

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Prepaid Expenses and Other Assets (Details 2) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Mortgage and other investing receivables    
Mortgage and other investing receivables $ 38,441,000 $ 33,396,000
Allowances for credit losses in connection with receivables 0 0
Fair value of mortgage and other investing receivables 38,400,000 33,400,000
Notes receivable from City of Huntsville
   
Mortgage and other investing receivables    
Mortgage and other investing receivables 38,441,000 33,252,000
Mortgage loans receivable
   
Mortgage and other investing receivables    
Mortgage and other investing receivables 0 144,000
Operating notes receivable
   
Operating Notes Receivable    
Operating notes receivables due from tenants with terms exceeding one year $ 261,000 $ 271,000