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INVENTORIES (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of inventories
Information regarding the Company's inventories is as follows (in thousands):
 
December 31,
 
2017
 
2016
Raw materials
$
58,725

 
$
60,217

Work-in-process
6,943

 
7,186

Finished goods
79,277

 
74,669

 
$
144,945

 
$
142,072