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Income Taxes (Details) (USD $)	3 Months Ended
Income Taxes (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income Taxes
Effective tax rate (as a percent)	38.10%	133.70%
Income tax expense	$ 9,116,000	$ 4,776,000
Adjustment to certain stock-based compensation items included in current year expense	400,000
Gross unrecognized tax benefits	$ 4,100,000		$ 4,000,000

- 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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