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Inventories (Schedule Of Components Of Inventories) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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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

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