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Income Taxes (Income From Continuing Operations Before Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
United States $ 313,351 $ 299,304 $ 248,932
Foreign 285,661 281,869 238,718
Income from continuing operations before income taxes $ 599,012 $ 581,173 $ 487,650