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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories

As of September 30, 2018 and December 31, 2017, inventories consisted of the following:

(in thousands)   September 30,
2018
December 31,
2017
Raw materials $42,011 $42,215
Work in process  45,621  65,448
Finished goods  12,133  28,856
Total inventories $99,765 $136,519