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Inventories (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories Inventories consist of the following (in thousands):
June 30, 2021December 31, 2020
Raw materials$297,535 $241,095 
Work-in-process43,888 41,950 
Total$341,423 $283,045