Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Current, Federal	$ 71,969	$ 96,575	$ 90,227
Deferred, Federal	32,099	(46,556)	(5,123)
Total, Federal	104,068	50,019	85,104
Current, State	25,086	33,368	28,125
Deferred, State	8,706	(16,387)	1,579
State, Total	33,792	16,981	29,704
Current income tax expense (benefit)	97,055	129,943	118,352
Deferred income tax expense (benefit)	40,805	(62,943)	(3,544)
Income tax expense (benefit)	$ 137,860	$ 67,000	$ 114,808