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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consist of the following (in thousands):
March 31, 2020December 31, 2019
Raw materials$244,850  $239,449  
Work-in-process12,764  21,122  
Total$257,614  $260,571