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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 with effective tax rate
Federal statutory tax rate	35.00%	35.00%	35.00%
Impact on deferred taxes for changes in tax rates	0.50%	2.60%	0.40%
State income taxes, net of federal income tax benefit	4.40%	3.90%	4.60%
Tax reviews and audits	(2.90%)	(0.90%)	(7.00%)
Miscellaneous items, net	(3.30%)	(1.90%)	0.10%
Effective tax rate	33.70%	38.70%	33.10%

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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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit that is attributable to changes in the income tax laws or rates.

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