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Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Mar. 31, 2012 element	Mar. 31, 2011
Income Taxes
Number of key elements of which income tax expense is comprised	2
Estimated effective annual tax rate (as a percent)	17.60%	29.70%
Federal statutory income tax 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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