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Supplemental Cash Flow Information (Schedule Of Cash Flow Information) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Supplemental Cash Flow Information [Abstract]      
Interest and financing expenses (net of capitalization) $ 17,329 $ 15,884 $ 12,456
Income taxes $ 96,919 $ 59,949 $ 94,093