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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consist of the following (in thousands):
June 30, 2020December 31, 2019
Raw materials$201,043  $239,449  
Work-in-process9,464  21,122  
Total$210,507  $260,571