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Income Taxes (Summary Of Provision For Income Taxes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Tax expense | $ 24,871 | $ 1,963 | $ 36,250 | $ 3,249
Pretax income (loss) | $ 225,063 | $ (5,190) | $ 660,252 | $ (39,515)
Effective tax rates (percentage) | 11.10% | (37.80%) | 5.50% | (8.20%)

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