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Equity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
From share of changes in equities of associates	$ 11	$ 105
Additional paid-in capital	104,749	104,427	$ 103,473
Ordinary Share [Member]
From ordinary shares	93,341	93,341	93,341
Treasury shares [member]
From treasury shares	5,080	4,784	4,041
Share of Changes in Equities of Associates [Member]
From share of changes in equities of associates	146	151	0
Share Based Compensation [Member]
From share-based compensation	$ 6,182	$ 6,151	$ 6,091

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- Definition

Additional Paid In Capital Increase Decrease Through Ordinary shares

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- Definition

Additional Paid In capital Increase Decrease Through Share Based Compensation

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- Definition

The amount received or receivable from the issuance of the entity's shares in excess of nominal value and amounts received from other transactions involving the entity's stock or stockholders.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The increase (decrease) in the entity's equity resulting from the change in the equity of subsidiaries. [Refer: Subsidiaries [member]]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The increase in equity resulting from the sale or issue of treasury shares. [Refer: Treasury shares]

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