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Income Taxes (Summary Of Provision For Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]        
Tax expense $ 20,755 $ 24,871 $ 90,940 $ 36,250
Pretax income $ 196,631 $ 225,063 $ 660,620 $ 660,252
Effective tax rates (percentage) 10.60% 11.10% 13.80% 5.50%