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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Statement of Financial Position [Abstract] |  |
Fixed maturity securities, held-to-maturity, fair value | $ 594,661 | $ 758,043
Fixed maturity securities, available-for-sale, amortized cost | 3,130,683 | 2,766,856
Equity securities, available-for-sale, cost | 132,441 | 143,826
Premiums receivable, allowance for uncollectible accounts | 3,906 | 3,768
Property and equipment, accumulated depreciation and amortization | $ 169,428 | $ 160,294
Preferred stock, par value per share | $ 0 | $ 0
Preferred stock, shares authorized | 5,000,000 | 5,000,000
Preferred stock, shares issued | 0 | 0
Preferred stock, shares outstanding | 0 | 0
Common stock, par value per share | $ 2 | $ 2
Common stock, shares authorized | 360,000,000 | 360,000,000
Common stock, shares issued | 98,194,224 | 97,246,711
Treasury stock, shares | 43,030,776 | 42,836,201

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