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Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Taxes
Income tax provision	$ 8,191,000	$ 14,683,000	$ 32,090,000	$ 33,249,000
Effective income tax rate (as a percent)	14.00%	21.70%	17.30%	17.50%
Income tax benefit due to change in estimate related to uncertain tax position	$ 1,400,000		$ 1,400,000	$ 3,300,000

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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

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