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

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

     
(in thousands)   June 30,  2018 December 31, 2017
Raw materials $39,822 $42,215
Work in process       44,526               65,448
Finished goods       13,311               28,856
Total inventories $97,659 $136,519