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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule Of Inventories
Inventories are comprised of the following: 
As of
June 30, 2020
As of
December 31, 2019
 (Dollars in thousands)
Inventories:
Raw materials$106,696  $104,820  
Work in process124,721  137,230  
Finished goods80,881  71,598  
         Total$312,298  $313,648