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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Statement of Financial Position [Abstract] |  |
Fixed income securities, held-to-maturity, fair value | $ 333,961 us-gaap_HeldToMaturitySecuritiesFairValue | $ 416,981 us-gaap_HeldToMaturitySecuritiesFairValue
Fixed income securities, available-for-sale, amortized cost | 3,975,786 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis | 3,675,977 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Equity securities, available-for-sale, cost | 159,011 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis | 155,350 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Premiums receivable, allowance for uncollectible accounts | 4,137 us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts | 4,442 us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts
Property and equipment, accumulated depreciation and amortization | $ 172,183 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | $ 179,192 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Preferred stock, par value per share | $ 0 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0 us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued | 0 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding | 0 us-gaap_PreferredStockSharesOutstanding | 0 us-gaap_PreferredStockSharesOutstanding
Common stock, par value per share | $ 2 us-gaap_CommonStockParOrStatedValuePerShare | $ 2 us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized | 360,000,000 us-gaap_CommonStockSharesAuthorized | 360,000,000 us-gaap_CommonStockSharesAuthorized
Common stock, shares issued | 99,947,933 us-gaap_CommonStockSharesIssued | 99,120,235 us-gaap_CommonStockSharesIssued
Treasury stock, shares | 43,353,181 us-gaap_TreasuryStockShares | 43,198,622 us-gaap_TreasuryStockShares

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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