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Inventories (Schedule Of Components Of Inventories) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Inventory, Net [Abstract] |  |
Finished goods | $ 13,018 | $ 13,935
Work-in-process | 10,754 | 9,249
Raw materials | 22,515 | 22,149
Stores, supplies and other | 20,393 | 19,992
Total | $ 66,680 | $ 65,325

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