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DERIVATIVE INSTRUMENTS (Narrative) (Details)
₪ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
ILS (₪)
Dec. 31, 2016
ILS (₪)
Outstanding forward exchange contracts | $ $ 10,743 $ 18,890    
Forward exchange contract remaining maturity 1 year 1 year    
Israel, New Shekels        
Outstanding forward exchange contracts | ₪     ₪ 38,077 ₪ 71,274