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Inventories (Tables)
9 Months Ended
Oct. 02, 2021
Inventory Disclosure [Abstract]  
Summary of Inventories Inventories consisted of the following:
(Dollars in thousands)
October 2,
2021
December 31,
2020
Raw materials and supplies$122,752 $107,983 
Work in process17,312 15,895 
Finished goods4,115 5,345 
Total$144,179 $129,223