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Income Taxes (Schedule Of Reconciliation Of The Differences Between The Effective Tax Rate And The Federal Statutory Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal income tax benefit	3.50%	3.50%	4.00%
Non-deductible employee stock purchase plan expense	0.30%	0.30%	0.40%
Non-deductible meals and entertainment	0.30%	0.30%	0.30%
Interest exempt from taxation and dividend exclusion			(0.10%)
Other, net	0.30%	0.10%	0.20%
Effective tax rate	39.40%	39.20%	39.80%

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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