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Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Supplemental Cash Flow Information      
Interest $ 64,970 $ 62,353 $ 64,342
Income taxes $ 22,501 $ 65,352 $ (1,050)