Equity (Tables)

12 Months Ended

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.