Income Taxes (Summary Of Provision For Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Tax expense	$ 21,920	$ 18,104	$ 45,942	$ 61,838
Pre-tax income	$ 141,806	$ 112,338	$ 292,792	$ 371,116
Effective tax rates (percentage)	15.50%	16.10%	15.70%	16.70%