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INVENTORIES (Tables)
 12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Carrying Values of Inventories
The carrying values of inventories were as follows (in thousands):
 
December 31, 2018
 
December 31, 2017
Finished goods
$
110,182

 
$
92,694

Work in process
17,344

 
11,593

Obsolescence reserve
(12,696
)
 
(12,874
)
Inventories
$
114,830

 
$
91,413