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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Tax expense and effective income tax rates [Abstract]
Income (loss) before income taxes	$ (2,356)	$ 7,029	$ (6,734)	$ 17,083
Income tax expense (benefit)	(143)	(1,057)	(1,418)	2,246
Effective tax rate (in hundredths)	6.10%	(15.00%)	21.10%	13.10%
Change in Deferred Tax Assets Valuation Allowance				4,008
Unrecognized tax benefits	$ 1,586		$ 1,586		$ 1,362

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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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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