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Inventories (Schedule Of Components Of Inventories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory, Net [Abstract]    
Finished goods $ 19,565 $ 24,504
Work-in-process 13,123 12,328
Raw materials 30,482 24,735
Stores, supplies and other 22,048 19,813
Total $ 85,218 $ 81,380