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Summary of Significant Accounting Policies (Details 8) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Beginning balance $ 122,214us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1] $ 367,089us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1]  
Other comprehensive income (loss) before reclassifications 169,500us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax [1] (230,416)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax [1]  
Amounts reclassified from accumulated other comprehensive income (7,113)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax [1] (14,459)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax [1]  
Net current period other comprehensive income (loss) 162,387us-gaap_OtherComprehensiveIncomeLossNetOfTax [1] (244,875)us-gaap_OtherComprehensiveIncomeLossNetOfTax [1] 115,109us-gaap_OtherComprehensiveIncomeLossNetOfTax
Ending balance 284,601us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1] 122,214us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1] 367,089us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1]
Unrealized Gains and Losses on Fixed Maturities and Equity Securities      
Beginning balance 133,990us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [1],[2] 382,400us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [1],[2]  
Other comprehensive income (loss) before reclassifications 170,677us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax [1],[2] (233,951)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax [1],[2]  
Amounts reclassified from accumulated other comprehensive income (7,113)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1],[2] (14,459)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1],[2]  
Net current period other comprehensive income (loss) 163,564us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [1],[2] (248,410)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [1],[2] 114,178us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Ending balance 297,554us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [1],[2] 133,990us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [1],[2] 382,400us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [1],[2]
Defined BenefitPlans      
Beginning balance (11,776)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax [1] (15,311)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax [1]  
Other comprehensive income (loss) before reclassifications (1,177)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax [1] 3,535us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax [1]  
Amounts reclassified from accumulated other comprehensive income 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax [1] 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax [1]  
Net current period other comprehensive income (loss) (1,177)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax [1] 3,535us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax [1] 931us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Ending balance $ (12,953)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax [1] $ (11,776)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax [1] $ (15,311)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax [1]
[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.