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INVENTORIES (Tables)
9 Months Ended
Sep. 30, 2018
INVENTORIES  
Schedule of inventories
(in thousands)  

September 30,

2018

    December 31, 
2017
 
Raw materials and supplies   $ 33,845     $ 20,116  
Work in process     9,732       8,300  
Finished goods     6,294       9,590  
Total inventories   $ 49,871     $ 38,006