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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Statement of Consolidated Balance Sheets    
Fixed maturity securities, held-to-maturity, fair value $ 711,731 $ 758,043
Fixed maturity securities, available-for-sale, amortized cost 2,897,522 2,766,856
Equity securities, available-for-sale, cost 130,213 143,826
Premiums receivable, allowance for uncollectible accounts 3,730 3,768
Property and equipment, accumulated depreciation and amortization $ 162,559 $ 160,294
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 97,809,949 97,246,711
Treasury stock, shares 43,004,815 42,836,201