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Income Taxes (Summary Of Provision For Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
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%)