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Inventories
 9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories are comprised of the following: 
As of
September 30, 2021		As of
December 31, 2020
 (Dollars in thousands)
Inventories:
Raw materials$121,872 $101,098 
Work in process114,332 110,331 
Finished goods33,505 54,535 
         Total$269,709 $265,964