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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventory, Net [Abstract]  
Schedule of Inventory, Current The components of inventories are as follows:
(In thousands)September 30, 2021December 31, 2020
Finished goods$21,614 $15,251 
Work-in-process12,586 9,098 
Raw materials32,836 25,913 
Stores, supplies and other18,650 16,175 
Total$85,686 $66,437