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Inventories (Tables)
9 Months Ended
Sep. 27, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories as of September 27, 2020 and December 31, 2019 consisted of the following:
 September 27, 2020December 31, 2019
 (Dollars in thousands)
Raw materials$135,059 $114,302 
Work-in-process73,375 71,479 
Finished goods317,691 290,776 
Inventories$526,125 $476,557