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Consolidated Statements Of Changes In Shareholders' Equity (USD $)
In Thousands
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Consolidated Statements Of Changes In Shareholders' Equity  
Total shareholders' equity at beginning of period$ 2,061,680$ 1,894,424
Comprehensive income:  
Net income162,121155,713
Other comprehensive income89,80397,035
Total comprehensive income251,924252,748
Stock option exercises/deferred stock unit conversions (144,203 shares in 2011 and 611,253 shares in 2010)7,23928,530
Stock compensation expense recognized in earnings10,01610,480
Tax benefits related to stock compensation304464
Purchase of treasury stock (29,823 shares in 2011 and 3,406 shares in 2010)(1,657)(193)
Treasury stock issued/sold to the 401(k) stock purchase plan (40,019 shares in 2010) 2,069
Common stock issued/sold to the 401(k) stock purchase plan (22,680 shares in 2011 and 150,165 shares in 2010)1,3608,183
Cash dividends ($1.37 per share in 2011 and $1.33 per share in 2010)(83,990)(80,568)
Total shareholders' equity at end of period$ 2,246,876$ 2,116,137