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Shareholders' Equity (Stock Option Activity) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stockholders' Equity Note [Abstract]      
Options, beginning balance 214,701 192,130 272,750
Options, granted 116,455 [1] 89,907  
Options, exercised (62,269) (61,711) (78,620)
Options, forfeited (2,882) (5,625) (2,000)
Options, ending balance 266,005 214,701 192,130
Options, exercisable 73,608    
Weighted average exercise price, granted $ 29.34 [1] $ 26.91  
Weighted average exercise price, exercised 15.28 15.28 $ 17.19
Weighted average exercise price, forfeited 29.71 24.07 15.28
Weighted average grant date fair value, granted 10.96 [1] 10.04  
Weighted average grant date fair value, exercised 6.54 6.54 7.70
Weighted average grant date fair value, forfeited $ 11.79 $ 9.19 $ 6.54
[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.