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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%

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