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Shareholders' Equity (Stock Option Summary) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, number of options	365,495	249,911	266,005	214,701
Options exercisable, number of options	124,312
$15.28 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price US$	$ 15.28
Options outstanding, number of options	6,575
Options outstanding, weighted average remaining contractual life (in years)	1 year 8 months 12 days
Options exercisable, number of options	6,575
Options exercisable, weighted average remaining contractual life (in years)	1 year 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	20,415
Options outstanding, weighted average remaining contractual life (in years)	4 years 7 months 6 days
Options exercisable, number of options	20,415
Options exercisable, weighted average remaining contractual life (in years)	4 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)	7 years 3 months 19 days
Options exercisable, number of options	19,706
Options exercisable, weighted average remaining contractual life (in years)	7 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	77,616
Options outstanding, weighted average remaining contractual life (in years)	5 years 4 months 24 days
Options exercisable, number of options	77,616
Options exercisable, weighted average remaining contractual life (in years)	5 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	109,840
Options outstanding, weighted average remaining contractual life (in years)	6 years 1 month 6 days
Options exercisable, number of options
36.11 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price US$	$ 36.11
Options outstanding, number of options	131,343
Options outstanding, weighted average remaining contractual life (in years)	7 years 3 months 19 days
Options exercisable, number of options

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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