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Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Mar. 31, 2012	Mar. 31, 2011
Reconciliation between the statutory United States federal income tax rate and the Company's effective income tax rate
Statutory rate	35.00%	35.00%
State taxes	1.90%	2.40%
Changes in tax reserves	(4.60%)	1.20%
Other, net	0.60%	0.20%
Effective rate	32.90%	38.80%

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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