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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
Difference between total tax expense and the amount computed by applying statutory Federal income tax rate
Statutory rate applied to income	$ 311,782	$ 266,624	$ 225,458
Plus state income taxes, net of Federal tax benefit	26,790	24,621	20,977
Other	(12,882)	(4,973)	(1,845)
Income Tax Expense, Total	$ 325,690	$ 286,272	$ 244,590

- 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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