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Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income from continuing operations before provision for income taxes
Provisions for income taxes at federal statutory rate	$ 45,567	$ 17,326	$ 12,906
State current and deferred income taxes	5,088	3,259	1,832
Domestic production activities deduction	(3,091)	(1,371)	(282)
Effect of tax return to tax provision reconciliation	(958)	(126)	676
Other	(398)	699	(108)
Provisions for income taxes	$ 46,208	$ 19,787	$ 15,024

X

- 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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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period 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 the deduction for qualified production activities received under enacted tax laws.

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