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Taxes on Income (Details 3) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Taxes on Income [Abstract] |  |
Long-term tax assets | $ 2,990 | $ 3,548
Long-term tax liabilities | (11,331) | (12,494)
Net deferred tax liabilities | $ (8,341) | $ (8,946)

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