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INVENTORIES (Tables)
 6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of components of inventory
Inventories consisted of the following:
 
June 30,
2019
 
December 31,
2018
Raw materials
$
31,773

 
$
26,544

Work-in-process
8,757

 
7,157

Finished goods
19,107

 
16,904

Supplies
343

 
469

 
$
59,980

 
$
51,074