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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule Of Inventories
Inventories are comprised of the following: 
As of
September 30, 2020
As of
December 31, 2019
 (Dollars in thousands)
Inventories:
Raw materials$95,136 $104,820 
Work in process126,673 137,230 
Finished goods77,427 71,598 
         Total$299,236 $313,648