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Income Taxes (Details 1)	12 Months Ended
Income Taxes (Details 1)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of federal statutory tax rate to the Company's effective tax rate
Federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal benefit	4.20%	4.10%	4.20%
Other	(0.60%)	(0.30%)	(1.00%)
Effective Income Tax Rate	38.60%	38.80%	38.20%

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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