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Inventories (Schedule Of Components Of Inventories) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventory, Net [Abstract]    
Finished goods $ 23,116 $ 24,504
Work-in-process 13,939 12,328
Raw materials 27,079 24,735
Stores, supplies and other 20,081 19,813
Total $ 84,215 $ 81,380