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Income Taxes (Details)	6 Months Ended
Income Taxes (Details)	Jun. 30, 2012	Jun. 30, 2011
Reconciliation of taxes from continuing operations
Effective income tax rate on continuing operations (as a percent)	33.20%	32.20%
Reconciliation of effective income tax rate with United States statutory rate (as a percent)	35.00%

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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