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Income Taxes (Schedule Of Federal And State And Foreign Income Tax Provision) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal, current $ 154,776 $ 158,411 $ 159,774
State, current 11,645 10,500 7,756
Foreign, current 8,002 5,137 5,224
Current federal, state and foreign income tax 174,423 174,048 172,754
Federal, deferred (26,350) 788 (5,343)
State, deferred 1,378 (168) 1,414
Foreign, deferred 3,199 0 0
Deferred income tax expense (benefit) (21,773) 620 (3,929)
Total income taxes $ 152,650 $ 174,668 $ 168,825