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Inventories
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories are comprised of the following: 
As of
March 31, 2022
As of
December 31, 2021
 (Dollars in thousands)
Inventories:
Raw materials and supplies$143,967 $132,113 
Work in process129,859 127,127 
Finished goods44,232 30,192 
         Total$318,058 $289,432