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Shareholders' Equity (Stock Option Summary) (Details) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding, number of options | 266,005 | 214,701 | 192,130 | 272,750
Options exercisable, number of options | 73,608 |  |  |
$15.28 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise price US$ | $ 15.28 |  |  |
Options outstanding, number of options | 66,775 |  |  |
Options outstanding, weighted average remaining contractual life (in years) | 3 years 8 months 12 days |  |  |
Options exercisable, number of options | 66,775 |  |  |
Options exercisable, weighted average remaining contractual life (in years) | 3 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 | 86,990 |  |  |
Options outstanding, weighted average remaining contractual life (in years) | 6 years 7 months 6 days |  |  |
Options exercisable, number of options |  |  |  |
Options exercisable, weighted average remaining contractual life (in years) | 0 years |  |  |
33.27 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise price US$ | $ 33.27 |  |  |
Options outstanding, number of options | 20,499 |  |  |
Options outstanding, weighted average remaining contractual life (in years) | 9 years 3 months 18 days |  |  |
Options exercisable, number of options | 6,833 |  |  |
Options exercisable, weighted average remaining contractual life (in years) | 9 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 | 91,741 |  |  |
Options outstanding, weighted average remaining contractual life (in years) | 7 years 4 months 24 days |  |  |
Options exercisable, number of options |  |  |  |
Options exercisable, weighted average remaining contractual life (in years) | 0 years |  |  |

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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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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