Quarterly report pursuant to Section 13 or 15(d)

Mortgage and Other Investing Receivables (Details)

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Mortgage and Other Investing Receivables (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage and other investing receivables $ 40,321 $ 33,396
Notes Receivable from City of Huntsville
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage and other investing receivables 40,321 33,252
Mortgage Receivable
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage and other investing receivables $ 0 $ 144