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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2018
INVENTORIES  
Schedule of Inventory
December 31,   2018     2017  
(in thousands)                
Raw materials   $ 26,874     $ 20,116  
Work in process     10,671       8,300  
Finished goods     9,225       9,590  
Total inventories   $ 46,770     $ 38,006