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Shareholders' Equity (Stock Option Activity) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stockholders' Equity Note [Abstract]      
Options, beginning balance 266,005 214,701 192,130
Options, granted 119,925 116,455 [1] 89,907
Options, exercised (124,918) (62,269) (61,711)
Options, forfeited (11,101) (2,882) (5,625)
Options, ending balance 249,911 266,005 214,701
Options, exercisable 40,544    
Weighted average exercise price, granted $ 39.62 $ 29.34 [1] $ 26.91
Weighted average exercise price, exercised 21.46 15.28 15.28
Weighted average exercise price, forfeited 33.18 29.71 24.07
Weighted average grant date fair value, granted 11.89 10.96 [1] 10.04
Weighted average grant date fair value, exercised 8.46 6.54 6.54
Weighted average grant date fair value, forfeited $ 10.87 $ 11.79 $ 9.19
[1] In 2016 the Company granted in the aggregate, 116,455 options. Regarding the grant of 93,660 options, see Note 11E. Regarding the grant of 22,795 options, see Note 3B.