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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data
Sep. 30, 2011
Dec. 31, 2010
Statement of Consolidated Balance Sheets  
Fixed maturity securities, held-to-maturity, fair value$ 901,385$ 1,256,294
Fixed maturity securities, available-for-sale, amortized cost2,649,0352,285,988
Equity securities, available-for-sale, cost150,51758,039
Premiums receivable, allowance for uncollectible accounts3,8634,691
Property and equipment, accumulated depreciation and amortization$ 158,383$ 151,704
Preferred stock, par value per share$ 0$ 0
Preferred stock, shares authorized5,000,0005,000,000
Preferred stock, shares issued00
Preferred stock, shares outstanding00
Common stock, par value per share$ 2$ 2
Common stock, shares authorized360,000,000360,000,000
Common stock, shares issued97,044,50396,362,667
Treasury stock, shares42,823,87142,686,204