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Income Taxes Schedule of tax expense and the effective tax rate for our income from continuing operations (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
Income Tax Disclosure [Abstract]
Income from continuing operations before income taxes	$ 10,003	$ 10,415	$ 24,126	$ 52,845
Provision for income taxes	$ 4,268	$ 3,244	$ 8,824	$ 13,396
Effective tax rate	42.70%	31.10%	36.60%	25.30%

- 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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