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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Statement of Financial Position [Abstract] |  |
Fixed maturity securities, held-to-maturity, fair value | $ 448,529 | $ 594,661
Fixed maturity securities, available-for-sale, amortized cost | 3,573,751 | 3,130,683
Equity securities, available-for-sale, cost | 158,323 | 132,441
Premiums receivable, allowance for uncollectible accounts | 4,513 | 3,906
Property and equipment, accumulated depreciation and amortization | $ 176,718 | $ 169,428
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 | 98,957,182 | 98,194,224
Treasury stock, shares | 43,182,331 | 43,030,776

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