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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2017
INVENTORIES  
Schedule of inventories
(in thousands)   March 31,
2017
    December 31,
2016
 
Raw materials and supplies   $ 22,898     $ 26,106  
Work in process     9,075       9,007  
Finished goods     6,595       7,375  
Total inventories   $ 38,568     $ 42,488