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Shareholders' Equity (Stock Option Activity) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stockholders' Equity Note [Abstract] |  |  |  |
Options, beginning balance | 249,911 | 266,005 | 214,701 |
Options, granted | 137,010 | 119,925 | 116,455 | [1]
Options, exercised | (9,674) | (124,918) | (62,269) |
Options, forfeited | (11,752) | (11,101) | (2,882) |
Options, ending balance | 365,495 | 249,911 | 266,005 |
Options, exercisable | 124,312 |  |  |
Weighted average exercise price, granted | $ 36.11 | $ 39.62 | $ 29.34 | [1]
Weighted average exercise price, exercised | 28.02 | 21.46 | 15.28 |
Weighted average exercise price, forfeited | 36.73 | 33.18 | 29.71 |
Weighted average grant date fair value, granted | 14.71 | 11.89 | 10.96 | [1]
Weighted average grant date fair value, exercised | 9.94 | 8.46 | 6.54 |
Weighted average grant date fair value, forfeited | $ 13.05 | $ 10.87 | $ 11.79 |
[1] | In 2016 the Company granted in the aggregate, 116,455 options. Regarding the grant of 93,660 options, see Note 12E. Regarding the grant of 22,795 options, see Note 3B.

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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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