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Shareholders' Equity (Stock Option Summary) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, number of options	590,047	465,247	365,495	249,911
Options exercisable, number of options	322,781
$26.91 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price US$	$ 26.91
Options outstanding, number of options	19,332
Options outstanding, weighted average remaining contractual life (in years)	2 years 7 months 6 days
Options exercisable, number of options	19,332
Options exercisable, weighted average remaining contractual life (in years)	2 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)	5 years 3 months 18 days
Options exercisable, number of options	19,706
Options exercisable, weighted average remaining contractual life (in years)	5 years 3 months 18 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	68,649
Options outstanding, weighted average remaining contractual life (in years)	3 years 4 months 24 days
Options exercisable, number of options	68,649
Options exercisable, weighted average remaining contractual life (in years)	3 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	101,004
Options outstanding, weighted average remaining contractual life (in years)	4 years 1 month 6 days
Options exercisable, number of options	101,004
Options exercisable, weighted average remaining contractual life (in years)	4 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	114,090
Options outstanding, weighted average remaining contractual life (in years)	5 years 3 months 18 days
Options exercisable, number of options	114,090
Options exercisable, weighted average remaining contractual life (in years)	5 years 3 months 18 days
33.83 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price US$	$ 33.83
Options outstanding, number of options	125,674
Options outstanding, weighted average remaining contractual life (in years)	6 years 1 month 6 days
Options exercisable, number of options
32.54 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price US$	$ 32.54
Options outstanding, number of options	141,592
Options outstanding, weighted average remaining contractual life (in years)	7 years 4 months 24 days
Options exercisable, number of options

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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.

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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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