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Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
Income Taxes (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Taxes
Income tax provision	$ 14,683,000	$ 10,649,000	$ 33,249,000	$ 32,113,000
Effective income tax rate (as a percent)	21.70%	16.50%	17.50%	18.00%
Income tax benefit due to change in estimate related to uncertain tax position			$ 3,300,000

- 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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- 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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