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Shareholders' Equity (Stock Option Activity) (Details) - $ / shares | 12 Months Ended
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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.

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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