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Inventories
3 Months Ended
Mar. 31, 2023
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories are comprised of the following: 
March 31, 2023December 31, 2022
 (Dollars in thousands)
Inventories:
Raw materials and supplies$217,587 $216,761 
Work in process206,732 192,821 
Finished goods44,290 38,159 
         Total$468,609 $447,741