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Inventories (Schedule Of Components Of Inventories) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Inventory, Net [Abstract] |  |
Finished goods | $ 21,442 | $ 16,215
Work-in-process | 10,695 | 8,590
Raw materials | 32,061 | 23,733
Stores, supplies and other | 18,228 | 17,531
Total | $ 82,426 | $ 66,069

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