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Mortgage and Other Investing Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage and other investing receivables $ 53,663 $ 35,798
Notes receivable from City of Huntsville
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage and other investing receivables 44,055 35,654
Mortgage loans receivable
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage and other investing receivables $ 9,608 $ 144
Number of mortgage loans receivable 1