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Income Taxes Effective Tax Rates (Details)	3 Months Ended
Income Taxes Effective Tax Rates (Details)	Mar. 31, 2012	Mar. 31, 2011
US Federal Effective Tax Rate	35.00%
Effective Income Tax Rate, Continuing Operations	27.00%	26.00%

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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