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Income Taxes (Difference In Income Tax Expense And Expected Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Federal income tax expense at the 'expected' rate of 35%	$ 201,278	$ 150,724	$ 104,122
State income taxes, net of federal benefit	18,210	14,259	9,650
State tax matters	737	1,238	785
Other, net	(3,073)	(937)	(1,424)
Total income tax expense	$ 217,152	$ 165,284	$ 113,133
Expected rate of federal income tax expense	35.00%

X

- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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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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