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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2019
INVENTORIES  
Schedule of inventories
(in thousands)   March 31,
2019
    December 31,
2018
 
Raw materials and supplies   $ 27,686     $ 26,874  
Work in process     10,640       10,671  
Finished goods     9,498       9,225  
Total inventories   $ 47,824     $ 46,770