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Comprehensive Income (Details 1) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Other investment related gains (losses), net $ 94,573,000 $ 58,348,000
Investment income, net of related expenses 425,131,000 340,940,000
Provision for income taxes 93,292,000 57,445,000
Net income 185,535,000 123,318,000
Unrealized Appreciation Depreciation Of Investments [Member]
    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 9,105,000  
Provision for income taxes (2,934,000)  
Net income 6,171,000  
Unrealized Appreciation Depreciation Of Investments [Member] | Unrealized Gains Losses On Available For Sale Securities [Member]
    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Other investment related gains (losses), net 10,348,000  
Unrealized Appreciation Depreciation Of Investments [Member] | Gains Losses On Qualifying Cash Flow Hedging Instruments [Member]
    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Investment income, net of related expenses 305,000  
Unrealized Appreciation Depreciation Of Investments [Member] | DAC Attributed To Unrealized Gains Losses [Member]
    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses (1,548,000)  
Amortization Of Unrealized Pension And Postretirement Benefits [Member]
    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (1,117,000)  
Provision for income taxes 391,000  
Net income (726,000)  
Amortization Of Unrealized Pension And Postretirement Benefits [Member] | Prior Service Cost [Member]
    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostCreditRecognizedInNetPeriodicBenefitCostBeforeTax (94,000)  
OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax (1,023,000)  
Amounts Reclassified From AOCI [Member]
    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Net income $ 5,445,000