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Inventories (Schedule Of Inventory Costs) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 312,856 | $ 304,069
Work in process | 8,687 | 8,282
Finished goods | 5,834 | 2,605
Inventories | $ 327,377 | $ 314,956

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