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Income Taxes (Summary Of Provision For Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Tax Disclosure [Abstract]        
Tax expense $ 19,788 $ 37,767 $ 43,734 $ 70,185
Pretax income $ 112,564 $ 234,135 $ 258,778 $ 463,989
Effective tax rates (percentage) 17.60% 16.10% 16.90% 15.10%