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
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage and other investing receivables $ 55,231 $ 53,663
Notes Receivable from City of Huntsville
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage and other investing receivables 45,381 44,055
Mortgage Receivable
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage and other investing receivables $ 9,850 $ 9,608
Number of mortgage loans receivable 1