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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
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