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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consist of the following (in thousands):
September 30, 2020December 31, 2019
Raw materials$164,346 $239,449 
Work-in-process13,621 21,122 
Total$177,967 $260,571