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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2016
INVENTORIES  
Schedule of Inventory
December 31,   2016     2015  
(in thousands)                
Raw materials   $ 26,106     $ 17,058  
Work in process     9,007       7,562  
Finished goods     7,375       8,018  
Total inventories   $ 42,488     $ 32,638