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Income Taxes (Schedule Of Effective Tax Rate) (Details) | 12 Months Ended | 36 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Abstract] |  |  |  |
Statutory U.S. federal income tax rate | 21.00% | 21.00% | 21.00% | 35.00%
State income tax, net of related federal income tax benefit | 4.20% | 4.10% | 6.60% |
Federal credits | (3.50%) | (1.70%) | (2.10%) |
Executive compensation disallowed | 2.90% | 2.00% | 1.40% |
Meals and entertainment | 0.10% | 0.10% | 0.10% |
Enhanced deduction for food donation | (0.10%) | 0.00% | (0.10%) |
Valuation allowance | 1.60% | 0.50% | 0.70% |
Other | 1.80% | 0.80% | 3.50% |
Return to provision and other discrete items | 2.10% | 0.10% | 1.10% |
Equity compensation related adjustments | (13.50%) | (3.30%) | 2.00% |
Federal net operating loss | (37.70%) |  |  |
Effective income tax rate | (21.10%) | 23.60% | 34.20% |

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