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Inventories (Schedule Of Inventory Costs) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
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