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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income Taxes [Abstract]
Effective tax rate (in hundredths)	26.20%	23.60%
Favorably impacted by net discrete items	$ 1,432	$ 8,016
Effective tax rate excluding discrete items (in hundredths)	26.80%	27.10%

- Definition

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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