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Inventories
 9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories, which are valued at the lower of cost or net realizable value, consisted of the following:
(Dollars in thousands)September 30, 2020December 31, 2019
Raw materials$52,105 $61,338 
Work-in-process26,452 30,043 
Finished goods31,176 41,478 
Total inventories$109,733 $132,859