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Fair Value of Assets and Liabilities (Details 2) (Fixed maturity securities available-for-sale, USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0 $ 16,849 $ 0 $ 16,849
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0 11,152 14,012 11,156
Corporate securities
        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0 2,996 0 2,996
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0 0 14,012 4
US Treasury And Government Member
        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0 0 0 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0 11,152 0 11,152
State and political subdivisions
        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0 12,794 0 12,794
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0 0 0 0
Other foreign government, supranational and foreign government-sponsored enterprises
        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0 1,059 0 1,059
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount $ 0 $ 0 $ 0 $ 0