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INVENTORIES
 12 Months Ended
Dec. 31, 2017
INVENTORIES [Abstract]  
INVENTORIES
7.
 INVENTORIES

The components of inventories are as follows:
  
December 31,
 
  
2017
  
2016
 
Raw materials
 
$
46,712
  
$
43,376
 
Work in progress
  
17,688
   
18,008
 
Finished goods
  
43,319
   
37,487
 
Inventories
 
$
107,719
  
$
98,871