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Inventories (Schedule Of Inventories) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Finished goods and work-in-process $ 325,588 $ 295,997
Raw materials 59,413 55,702
Stores, supplies, and other 16,030 14,239
Inventories $ 401,031 $ 365,938