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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Schedule Of Income Taxes
Expected income tax expense, at statutory rate			$ 8,239	$ 10,559
U.S. state income tax expense, net			1,019	1,914
Other, net			(305)	16
Income tax expense	$ 4,529	$ 6,404	$ 8,953	$ 12,489

- 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 amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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