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Inventories (Schedule Of Components Of Inventories) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Inventory, Net [Abstract]    
Finished goods $ 21,614 $ 15,251
Work-in-process 12,586 9,098
Raw materials 32,836 25,913
Stores, supplies and other 18,650 16,175
Inventories $ 85,686 $ 66,437