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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Statement of Consolidated Balance Sheets |  |
Fixed maturity securities, held-to-maturity, fair value | $ 758,043 | $ 1,256,294
Fixed maturity securities, available-for-sale, amortized cost | 2,766,856 | 2,285,988
Equity securities, available-for-sale, cost | 143,826 | 58,039
Premiums receivable, allowance for uncollectible accounts | 3,768 | 4,691
Property and equipment, accumulated depreciation and amortization | $ 160,294 | $ 151,704
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 | 97,246,711 | 96,362,667
Treasury stock, shares | 42,836,201 | 42,686,204

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