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Inventories (Tables)
6 Months Ended
Jun. 30, 2025
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories are comprised of the following: 
June 30, 2025December 31, 2024
 (Dollars in thousands)
Inventories:
Raw materials and supplies$89,721 $78,386 
Work in process136,039 122,590 
Finished goods30,166 30,265 
         Total$255,926 $231,241