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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of components of inventory
Inventories consisted of the following:
 
March 31,
2019
 
December 31,
2018
Raw materials
$
26,669

 
$
26,544

Work-in-process
6,934

 
7,157

Finished goods
16,888

 
16,904

Supplies
360

 
469

 
$
50,851

 
$
51,074