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Income Taxes (Schedule Of Effective Tax Rate) (Details)	12 Months Ended
Income Taxes (Schedule Of Effective Tax Rate) (Details)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
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	4.10%	4.10%	3.50%
Federal credits		(0.80%)	(0.40%)
Other	0.20%	0.20%
Effective income tax rates	39.30%	38.50%	38.10%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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