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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Equity securities, cost $ 1,852,640 $ 1,436,540
Debt securities, amortized cost $ 14,755,756 $ 15,593,278
Common stock, shares authorized 22,000,000 22,000,000
Common stock, shares issued 17,459,961 17,478,746
Treasury stock, shares 674,653 588,123