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Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Schedule Of Inventories
Inventories are comprised of the following: 
As of
March 31, 2021
As of
December 31, 2020
 (Dollars in thousands)
Inventories:
Raw materials$95,987 $101,098 
Work in process112,411 110,331 
Finished goods42,412 54,535 
         Total$250,810 $265,964