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Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories
Inventories, which are valued at the lower of cost or net realizable value, consisted of the following:
(Dollars in thousands)March 31, 2021December 31, 2020
Raw materials$47,197 $44,976 
Work-in-process29,243 25,291 
Finished goods30,266 32,093 
Total inventories$106,706 $102,360