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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consist of the following (in thousands):
 
 
December 31,
 
 
2019
 
2018
Raw materials
 
$
239,449

 
$
64,256

Work-in-process
 
21,122

 
15,211

Total
 
$
260,571

 
$
79,467