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Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
Income Taxes (Details) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Taxes
Provision for income taxes	$ 10,109,000	$ 9,589,000	$ 12,907,000	$ 10,571,000
Effective income tax rate (as a percent)			38.60%	80.80%
Incremental deferred income tax expense, net of federal benefit, recognized for the reversal of previously established deferred tax assets		$ 5,100,000

- 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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