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Derivatives Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]      
Cost of revenues $ 25,907 $ 22,587 $ 22,112
Sales and marketing 3,705 3,389 3,111
General and administrative 1,834 1,870 1,498
Foreign currency derivatives [Member]      
Derivative [Line Items]      
Cost of revenues 18 (63)
Sales and marketing 13 (61) 1
General and administrative 6 (24)
Total expenses (income) $ 37 $ (148) $ 1