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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2016
INVENTORIES  
Schedule of inventories
(in thousands)   March 31,
2016
    December 31,
2015
 
Raw materials and supplies   $ 17,802     $ 17,058  
Work in process     7,823       7,562  
Finished goods     6,032       8,018  
Total inventories   $ 31,657     $ 32,638