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Shareholders' Equity (Summary Of Share Option Activity Under The Stock Option Plan) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Shareholders' Equity [Abstract]      
Outstanding-beginning of the year, Number of options 1,635,305 1,858,250 2,454,851
Granted, Number of options 63,300 28,000 58,500
Exercised, Number of options (226,965) (223,020) (619,451)
Forfeited, Number of options (20,750) (27,925) (35,650)
Outstanding-end of the year, Number of options 1,450,890 1,635,305 1,858,250
Options exercisable at the end of the year, Number of options 1,292,806 963,289 586,626
Outstanding-beginning of the year, Weighted average exercise price $ 35.96 $ 35.24 $ 33.96
Granted, Weighted average exercise price $ 50.74 $ 52.23 $ 50.33
Exercised, Weighted average exercise price $ 32.41 $ 32.53 $ 31.62
Forfeited, Weighted average exercise price $ 42.33 $ 31.91 $ 34.53
Outstanding-end of the year, Weighted average exercise price $ 37.07 $ 35.96 $ 35.24
Rights vested at the end of the year, Weighted average exercise price $ 35.17 $ 34.70 $ 32.55