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Derivatives Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]      
Cost of revenues $ 20,462 $ 22,556 $ 20,872
Sales and marketing 2,768 3,043 2,924
General and administrative 1,681 $ 1,882 $ 1,523
Total expenses 124
Foreign currency derivatives [Member]      
Derivative [Line Items]      
Cost of revenues 32
Sales and marketing 60
General and administrative $ 32