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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Fixed income securities, held-to-maturity, fair value $ 311,093us-gaap_HeldToMaturitySecuritiesFairValue $ 333,961us-gaap_HeldToMaturitySecuritiesFairValue
Fixed income securities, available-for-sale, amortized cost 4,059,034us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 3,975,786us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Equity securities, available-for-sale, cost 199,617us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis 159,011us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Premiums receivable, allowance for uncollectible accounts 4,201us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts 4,137us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts
Property and equipment - at cost, accumulated depreciation and amortization $ 175,896us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 172,183us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Preferred stock, par value per share $ 0us-gaap_PreferredStockParOrStatedValuePerShare $ 0us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value per share $ 2us-gaap_CommonStockParOrStatedValuePerShare $ 2us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 360,000,000us-gaap_CommonStockSharesAuthorized 360,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 100,430,480us-gaap_CommonStockSharesIssued 99,947,933us-gaap_CommonStockSharesIssued
Treasury stock - at cost, shares 43,482,438us-gaap_TreasuryStockShares 43,353,181us-gaap_TreasuryStockShares