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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
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