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Income Tax Expense (Schedule Of Income Before Income Taxes And Provision For Income Taxes) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Tax Expense [Abstract]      
Income before income tax expense, Domestic $ 198,153 $ 149,640 $ 184,217
Income before income tax expense, Foreign 105,564 110,356 55,159
Income before income tax expense 303,717 259,996 239,376
Current income taxes, Federal 55,909 45,658 51,374
Current income taxes, State 9,996 4,470 5,337
Current income taxes, Foreign 28,530 30,810 16,125
Current income taxes 94,435 80,938 72,836
Deferred income taxes, Federal 1,380 1,319 4,768
Deferred income taxes, State 230 62 (1,901)
Deferred income taxes, Foreign 765 552 1,390
Deferred income taxes 2,375 1,933 4,257
Total income tax expense $ 96,810 $ 82,871 $ 77,093