Income Taxes (Details)	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate	35.00%
Effective tax rate	25.90%	21.70%

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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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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