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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 |

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