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Inventories
6 Months Ended
Jun. 30, 2022
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories are comprised of the following: 
As of
June 30, 2022
As of
December 31, 2021
 (Dollars in thousands)
Inventories:
Raw materials and supplies$195,300 $132,113 
Work in process161,189 127,127 
Finished goods40,260 30,192 
         Total$396,749 $289,432