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Income Taxes (Schedule Of Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Statutory U.S. federal income tax rate	21.00%	35.00%	35.00%
State income tax, net of related federal income tax benefit	6.60%	4.40%	13.30%
Federal credits	(2.10%)	(1.50%)	(10.10%)
Executive compensation disallowed	1.40%	0.00%	0.00%
Meals and entertainment	0.10%	0.00%	0.00%
Enhanced deduction for food donation	(0.10%)	(0.20%)	(2.40%)
Valuation allowance	0.70%	0.10%	6.00%
Other	3.50%	1.50%	6.20%
Effects of TCJA	0.00%	(2.30%)	0.00%
Return to provision and other discrete items	1.10%	(0.90%)	(7.20%)
Equity compensation related adjustments	2.00%	0.00%	0.00%
Effective income tax rate	34.20%	36.10%	40.80%

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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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