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Shareholders' Equity (Stock Option Summary) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, number of options	465,247	365,495	249,911	266,005
Options exercisable, number of options	219,649
$15.28 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price US$	$ 15.28
Options outstanding, number of options	6,575
Options outstanding, weighted average remaining contractual life (in years)	8 months 12 days
Options exercisable, number of options	6,575
Options exercisable, weighted average remaining contractual life (in years)	8 months 12 days
$26.91 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price US$	$ 26.91
Options outstanding, number of options	19,332
Options outstanding, weighted average remaining contractual life (in years)	3 years 7 months 6 days
Options exercisable, number of options	19,332
Options exercisable, weighted average remaining contractual life (in years)	3 years 7 months 6 days
33.27 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price US$	$ 33.27
Options outstanding, number of options	19,706
Options outstanding, weighted average remaining contractual life (in years)	6 years 3 months 19 days
Options exercisable, number of options	19,706
Options exercisable, weighted average remaining contractual life (in years)	6 years 3 months 19 days
28.38 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price US$	$ 28.38
Options outstanding, number of options	72,198
Options outstanding, weighted average remaining contractual life (in years)	4 years 4 months 24 days
Options exercisable, number of options	72,198
Options exercisable, weighted average remaining contractual life (in years)	4 years 4 months 24 days
39.62 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price US$	$ 39.62
Options outstanding, number of options	101,838
Options outstanding, weighted average remaining contractual life (in years)	5 years 1 month 6 days
Options exercisable, number of options	101,838
Options exercisable, weighted average remaining contractual life (in years)	5 years 1 month 6 days
36.11 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price US$	$ 36.11
Options outstanding, number of options	116,257
Options outstanding, weighted average remaining contractual life (in years)	6 years 3 months 19 days
Options exercisable, number of options
33.83 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price US$	$ 33.83
Options outstanding, number of options	129,342
Options outstanding, weighted average remaining contractual life (in years)	7 years 1 month 6 days
Options exercisable, number of options

X

- 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.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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