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Inventories, Net (Schedule Of Inventories, Net) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Inventories, Net [Abstract]    
Finished products $ 350,685 $ 358,138
Products in process and raw materials 11,116 13,842
Supplies and expendable parts 53,287 46,958
Inventories, Gross 415,088 418,938
Less allowances (92,481) (87,044)
Total $ 322,607 $ 331,894