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Income Taxes (Details) (USD $)	3 Months Ended			9 Months Ended
Income Taxes (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Taxes
Provision for income taxes	$ 11,194,000	$ 2,247,000		$ 24,101,000	$ 12,818,000
Effective income tax rate (as a percent)				37.50%	69.90%
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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