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Taxes on Income (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
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)