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Notes Payable (Line of Credit Narrative) (Details) - 2013 Line of Credit [Member]
$ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
banks
occasions
guarantor
Dec. 31, 2014
USD ($)
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing capacity $ 140,000  
Line of credit, number of banks in agreement | banks 5  
Line of credit, interest rate, floating, applicable margin 0.75%  
Line of credit, interest rate, floating, adjusted LIBOR 1.75%  
Line of credit, unused capacity, commitment fee percentage 0.30%  
Minimum risk-based capital ratio 275.00%  
Maximum debt to capital ratio 0.35  
Minimum capital to be retained 80.00%  
Minimum portion of net income to be retained 50.00%  
Minimum capital contributions to be retained 50.00%  
Line of credit, number of occasions borrowing capacity can be increased | occasions 3  
Line of credit, additional borrowing capacity, aggregate amount $ 50,000  
Line of credit, maturity date extension available, years 1 year  
Line of credit, number of guarantors | guarantor 0  
Line of credit, amount outstanding $ 0 $ 0
Cash in excess of amount required by covenants $ 577,500