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Equity (Schedule of Composition of Share Capital) (Details) - ₪ / shares | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of classes of share capital [abstract] |  |  |  |
Ordinary shares of NIS 10 par value, Authorized |  | 17,000,000 | 17,000,000 | 17,000,000
Ordinary shares of NIS 10 par value, Outstanding | [1] | 10,675,508 | 10,677,370 | 10,678,888
Ordinary shares par value |  | ₪ 10 | ₪ 10 | ₪ 10
[1] | Net of treasury shares as follows: 258,046 Ordinary shares as of December 31, 2017, 256,184 Ordinary shares as of December 31, 2016 and 254,666 Ordinary shares as of December 31, 2015, all of which have been purchased according to share buyback programs that were authorized the Company's Board of Directors.

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- Definition The number of shares authorised. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iii&doctype=Standard -URIDate 2017-03-09 + Details
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