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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2017
INVENTORIES  
Schedule of Inventory
December 31,   2017     2016  
(in thousands)                
Raw materials                                    $ 20,116     $ 26,106  
Work in process                              8,300       9,007  
Finished goods                           9,590       7,375  
Total inventories                      $ 38,006     $ 42,488