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Shareholders' Equity (Fair Value Assumptions) (Details) - item |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 08, 2016 | Apr. 30, 2018 | Jan. 30, 2018 | Jan. 30, 2017 | Jul. 28, 2015 | Dec. 31, 2015 | Dec. 31, 2014
$39.62 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Average risk-free interest rate | [1] |  | 2.92% |  | 2.35% |  |  |
Expected dividend yield |  |  | 0.00% |  | 2.42% |  |  |
Average expected volatility | [2] |  | 45.13% |  | 43.71% |  |  |
Termination rate |  |  | 9.00% |  | 9.00% |  |  |
Suboptimal factor | [3] |  | 3.2 |  | 3.28 |  |  |
$28.38 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Average risk-free interest rate | [1] | 1.58% |  |  |  |  |  |
Expected dividend yield |  | 2.42% |  |  |  |  |  |
Average expected volatility | [2] | 47.90% |  |  |  |  |  |
Termination rate |  | 9.00% |  |  |  |  |  |
Suboptimal factor | [3] | 3.32 |  |  |  |  |  |
$26.91 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Average risk-free interest rate | [1] |  |  |  |  | 2.08% |  |
Expected dividend yield |  |  |  |  |  | 2.09% |  |
Average expected volatility | [2] |  |  |  |  | 53.01% |  |
Termination rate |  |  |  |  |  | 9.00% |  |
Suboptimal factor | [3] |  |  |  |  | 3.4 |  |
Restricted Share Units [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expected dividend yield |  |  |  | 2.68% |  |  | 3.22% | 2.06%
Termination rate |  |  |  | 1.74% |  |  | 0.00% | 4.35%
[1] | Risk-free interest rate represents risk free US$ zero-coupon US Government Bonds at time of grant.
[2] | Expected average volatility represents a weighted average standard deviation rate for the price of the Company's ordinary shares on the NASDAQ National Market.
[3] | Suboptimal factor represents the multiple of the increase in the market share price on the day of grant of the option which, should it come to pass, will lead to exercise of the option by the employee. It is the average suboptimal factor of the Company and similar companies.

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- Definition Represents the multiple of the increase in the market share price on the day of grant of the option which, should it come to pass, will lead to exercise of the option by the employee. It is the average suboptimal factor of the Company and similar companies. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Termination Rate + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average expected volatility rate of share-based compensation awards. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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