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Inventories (Schedule Of Inventory Costs) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Inventories [Abstract] |  |
Raw materials | $ 326,924 | $ 304,069
Work in process | 7,941 | 8,282
Finished goods | 3,572 | 2,605
Inventories | $ 338,437 | $ 314,956

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