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Derivatives Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative [Line Items]      
Cost of revenues $ 22,112 $ 20,462 $ 22,556
Sales and marketing 3,111 2,768 3,043
General and administrative 1,498 1,681 1,882
Foreign currency derivatives [Member]      
Derivative [Line Items]      
Cost of revenues 32
Sales and marketing 1 60
General and administrative 32
Total expenses $ 1 $ 124