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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Tax at statutory rate	$ 61,217	$ 47,683	$ 34,593
State income taxes, net of federal tax benefits	9,250	5,068	3,498
Non-deductible meals and entertainment	2,571	2,943	3,558
Income tax credits	(1,517)	(525)	(480)
Other, net	628	1,029	1,084
Total income tax expense	$ 72,149	$ 56,198	$ 42,253

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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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