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Income Taxes (Schedule of Components of the Provision for Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes
Federal income taxes at statutory rate	$ 329,532	$ 285,524	$ 241,281
State income taxes, net of federal tax benefit	22,426	16,132	22,267
Other items, net	3,817	6,444	6,452
Provision for income taxes	$ 355,775	$ 308,100	$ 270,000

- 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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