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Income Taxes (Schedule Of Income Before Income Tax) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Domestic $ 192,857 $ 161,573 $ 114,389
Foreign 81,024 70,301 54,438
Income before income taxes $ 273,881 $ 231,874 $ 168,827