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Notes Payable and Amounts Due Under Repurchase Agreements (Line of Credit Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
2011 Line of Credit [Member]
Dec. 31, 2012
2011 Line of Credit [Member]
Dec. 31, 2013
2013 Line of Credit [Member]
guarantor
occasions
banks
Line of Credit Facility [Line Items]      
Line of credit, maximum borrowing capacity $ 160   $ 140
Line of credit, number of banks in agreement     5
Line of credit, length of credit agreement, years     4 years
Line of credit, interest rate, floating, applicable margin     1.00%
Line of credit, interest rate, floating, adjusted LIBOR     2.00%
Line of credit, unused capacity, commitment fee percentage     0.35%
Minimum risk-based captial 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     3
Line of credit, additional borrowing capacity, aggregate amount     50
Line of credit, duration of maturity date extension available, years     1 year
Line of credit, number of guarantors     0
Line of credit, amount outstanding   0 0
Cash in excess of amount required by covenants     $ 389.0