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Income Taxes (Schedule Of Provision For Income Taxes) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Abstract] |  |  |
Current, U.S. federal | $ 58,602 | $ 36,779 | $ 23,934
Current, U.S. state and local | 15,950 | 7,078 | 4,484
Current, Foreign | 539 | 600 | 452
Deferred, U.S. federal, state and local | 1,456 | (2,773) | 5,185
Deferred, Foreign | (23) | 2 | 1
Income tax provision | $ 76,524 | $ 41,686 | $ 34,056

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