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INVENTORIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]      
Raw materials $ 12,011 $ 7,651  
Work in progress 576 232  
Finished products 41,577 37,764  
Inventories, Net 54,164 45,647  
Inventory write-off $ 3,932 $ 4,503 $ 5,124