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INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2016
INVENTORIES  
Schedule of inventories

 

(in thousands)  

as of June 30,

2016

    as of December 31,
2015
 
Raw materials and supplies   $ 22,499     $ 17,058  
Work in process     7,393       7,562  
Finished goods     4,700       8,018  
Total inventories   $ 34,592     $ 32,638