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Summary of Significant Accounting Policies (Details 7) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Components of comprehensive income                              
Net income $ 30,068us-gaap_NetIncomeLoss $ 25,357us-gaap_NetIncomeLoss $ 20,452us-gaap_NetIncomeLoss $ 28,366us-gaap_NetIncomeLoss $ 34,287us-gaap_NetIncomeLoss $ 23,599us-gaap_NetIncomeLoss $ 25,995us-gaap_NetIncomeLoss $ 27,012us-gaap_NetIncomeLoss $ 31,826us-gaap_NetIncomeLoss $ 32,266us-gaap_NetIncomeLoss $ 13,103us-gaap_NetIncomeLoss $ 26,671us-gaap_NetIncomeLoss $ 104,243us-gaap_NetIncomeLoss $ 110,893us-gaap_NetIncomeLoss $ 103,866us-gaap_NetIncomeLoss
Change in net unrealized gains and losses on fixed maturities and equity securities                              
Net unrealized holding gains and losses on fixed maturities and equity securities arising during the period                         264,136us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax (363,350)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax 204,460us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Less: reclassification adjustment for net gains included in income before income tax                         10,943us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax 22,245us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax 27,298us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Total, before tax                         253,193us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax (385,595)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax 177,162us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Income tax expense (benefit)                         89,629us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent (137,185)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent 62,984us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent
Total, net of tax                         163,564us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [1],[2] (248,410)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [1],[2] 114,178us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Change in net funded status of pension and other postretirement benefit obligations                              
Before tax                         (1,810)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 5,645us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 1,276us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Income tax expense (benefit)                         (633)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent 2,110us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent 345us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent
Total, net of tax                         (1,177)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax [1] 3,535us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax [1] 931us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Total comprehensive income (loss)                         $ 266,630us-gaap_ComprehensiveIncomeNetOfTax $ (133,982)us-gaap_ComprehensiveIncomeNetOfTax $ 218,975us-gaap_ComprehensiveIncomeNetOfTax
[1] All amounts are net of tax.
[2] The pretax amounts reclassified from accumulated other comprehensive income, $10,943 and $22,245, are included in net realized investment gains and losses and the related tax expenses, $3,830 and $7,786, are included in income tax expense in the Consolidated Statements of Operations for the years ended December 31, 2014 and 2013, respectively.