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Inventories (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Inventory [Line Items]    
U.S. inventories, LIFO basis $ 124,000 $ 116,000
LIFO inventories amount below replacement cost 37,000 50,000
Inventories 401,031 365,938
International companies    
Inventory [Line Items]    
Inventories $ 255,000 $ 238,000