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Income Taxes (Schedule Of Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Statutory U.S. federal income tax rate	21.00%	21.00%	35.00%
State income tax, net of related federal income tax benefit	4.10%	6.60%	4.40%
Federal credits	(1.70%)	(2.10%)	(1.50%)
Executive compensation disallowed	2.00%	1.40%	0.00%
Meals and entertainment	0.10%	0.10%	0.00%
Enhanced deduction for food donation	0.00%	(0.10%)	(0.20%)
Valuation allowance	0.50%	0.70%	0.10%
Other	0.80%	3.50%	1.50%
Effects of the TCJA	0.00%	0.00%	(2.30%)
Return to provision and other discrete items	0.10%	1.10%	(0.90%)
Equity compensation related adjustments	(3.30%)	2.00%	0.00%
Effective income tax rate	23.60%	34.20%	36.10%

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