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Income Taxes (Summary Of Provision For Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Tax expense	$ 18,104	$ 20,755	$ 61,838	$ 90,940
Pretax income	$ 112,338	$ 196,631	$ 371,116	$ 660,620
Effective tax rates (percentage)	16.10%	10.60%	16.70%	13.80%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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