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Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of classes of share capital [abstract] |
Schedule of Composition of Share Capital |
Composition of share capital
|  | December 31, 2017 |  |  | December 31, 2016 |  |  | December 31, 2015 |
|  |  |  |  | Issued and |  |  |  |  |  | Issued and |  |  |  |  |  | Issued and |
|  | Authorized |  |  | Outstanding(1) |  |  | Authorized |  |  | Outstanding(1) |  |  | Authorized |  |  | Outstanding |
|  |  | Number of shares |
Ordinary shares of NIS 10.00 par value each |  |  | 17,000,000 |  |  |  | 10,675,508(1) |  |  |  | 17,000,000 |  |  |  | 10,677,370(1) |  |  |  | 17,000,000 |  |  |  | 10,678,888(1) |
(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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