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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012 Rate	Jun. 30, 2011 Rate	Jun. 30, 2012	Jun. 30, 2012 Rate	Jun. 30, 2011	Jun. 30, 2011 Rate
Income Tax Expense Benefit and Effective Income Tax Rates
Income tax expense (benefit)	$ 6,926	$ 1,129		$ 9,215		$ (282)
Effective income tax rate	38.60%	30.60%	39.10%	39.10%	35.00%	35.00%

- 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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