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INVENTORIES (Tables)
 3 Months Ended
Mar. 31, 2018
INVENTORIES [Abstract]  
Carrying Values of Inventories
The carrying values of inventories are as follows (in thousands):

  
March 31,
2018
  
December 31,
2017
 
       
Finished goods
 
$
90,402
  
$
79,820
 
Work in process
  
12,792
   
11,593
 
Inventories
 
$
103,194
  
$
91,413