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INVENTORIES (Tables)
9 Months Ended
Sep. 30, 2017
INVENTORIES  
Schedule of inventories
(in thousands)   September 30,
2017
    December 31,
 2016
 
Raw materials and supplies   $ 24,008     $ 26,106  
Work in process     7,950       9,007  
Finished goods     9,484       7,375  
Total inventories   $ 41,442     $ 42,488