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Shareholders' Equity (Summary Of Share Option Activity Under The Stock Option Plan) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding-beginning of the year, Number of options 1,385,492 1,450,890 1,635,305
Granted, Number of options 21,000 30,000 63,300
Exercised, Number of options (1,094,592) (69,898) (226,965)
Forfeited, Number of options (44,300) (25,500) (20,750)
Outstanding-end of the year, Number of options 267,600 1,385,492 1,450,890
Options exercisable at the end of the year, Number of options 190,300 1,271,266 1,292,806
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Outstanding-beginning of the year, Weighted average exercise price $ 36.95 $ 37.07 $ 35.96
Granted, Weighted average exercise price $ 39.60 $ 35.21 $ 50.74
Exercised, Weighted average exercise price $ 33.61 $ 33.19 $ 32.41
Forfeited, Weighted average exercise price $ 53.47 $ 51.83 $ 42.33
Outstanding-end of the year, Weighted average exercise price $ 48.09 $ 36.95 $ 37.07
Options exercisable at the end of the year, Weighted average exercise price $ 50.04 $ 36.07 $ 35.17