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Income Taxes (Schedule Of Effective Tax Rate) (Details)	12 Months Ended			36 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	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	3.50%	4.20%	4.10%
Federal credits	(1.60%)	(3.50%)	(1.70%)
Executive compensation disallowed	2.90%	2.90%	2.00%
Meals and entertainment	0.00%	0.10%	0.10%
Enhanced deduction for food donation	0.00%	(0.10%)	0.00%
Valuation allowance	0.30%	1.60%	0.50%
Other	0.00%	1.80%	0.80%
Return to provision and other discrete items	0.10%	2.10%	0.10%
Equity compensation related adjustments	(4.70%)	(13.50%)	(3.30%)
Federal net operating loss	(1.80%)	(37.70%)
Effective income tax rate	19.70%	(21.10%)	23.60%

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Effective Income Tax Rate Reconciliation, Federal Net Operating Loss, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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