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Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Taxes
Income tax provision	$ 11,951,000	$ 11,049,000	$ 18,566,000	$ 21,464,000
Effective income tax rate (as a percent)	17.90%	17.90%	15.20%	18.90%
Income tax benefit due to change in estimate related to uncertain tax position			$ 3,300,000

X

- 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.

+ References

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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-Publisher FASB

-Name Accounting Standards Codification

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The net amount of all increases and decreases in unrecognized tax benefits for the period.

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