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Notes and Loan Payable and Amounts Due Under Repurchase Agreements (Line of Credit and Term Loan Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
banks
occasions
guarantor
Dec. 31, 2016
USD ($)
2016 Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing capacity $ 150,000  
Line of credit, unused capacity, commitment fee percentage 0.275%  
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, amount outstanding $ 0  
September 30, 2016 Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Number of banks in agreement | banks 6  
Credit agreement, interest rate, floating, applicable margin 0.75%  
Credit agreement, interest rate, floating, adjusted LIBOR 1.75%  
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%  
Credit agreement, number of guarantors | guarantor 0  
Cash in excess of amount required by covenants $ 658,800  
Term Loan [Member]    
Line of Credit Facility [Line Items]    
Term loan $ 100,000 $ 100,000
Term loan, interest rate, effective percentage 3.125%