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Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
U.S. federal, Current $ 92,035 $ 82,556 $ 90,390
State and local, Current 14,798 12,323 10,223
Current, income tax expense (benefit) 106,833 94,879 100,613
U.S. federal, Deferred (14,055) 11,388 3,220
State and local, Deferred (5,485) 2,807 2,116
Deferred, income tax expense (benefit) (19,540) 14,195 5,336
U.S. federal, Total 77,980 93,944 93,610
State and local, Total 9,313 15,130 12,339
Total income tax expense $ 87,293 $ 109,074 $ 105,949