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Income Taxes (Schedule Of Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Statutory U.S. federal income tax rate	35.00%	35.00%	35.00%
State income tax, net of related federal income tax benefit	4.40%	13.30%	3.60%
Federal credits	(1.50%)	(10.10%)	(0.40%)
Enhanced deduction for food donation	(0.20%)	(2.40%)	(0.20%)
Valuation allowance	0.10%	6.00%	0.30%
Other	1.50%	6.20%	0.00%
Effects of TCJA on existing temporary differences	(2.30%)	0.00%	0.00%
Return to provision and other discrete items	(0.90%)	(7.20%)	(0.10%)
Effective income tax rate	36.10%	40.80%	38.20%

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