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Income Taxes (Schedule Of Effective Reconciliation Of The U.S. Statutory Federal Income Tax Rates) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Tax provision at statutory rate on income before income taxes	$ 95,584	$ 77,029	$ 43,549
State income taxes, net of federal benefit	10,211	7,480	5,002
Meals and entertainment disallowance	828	721	616
Tax credits	(2,609)	(4,453)	(744)
Other, net	(368)	(163)	352
Total provision for income taxes	$ 103,646	$ 80,614	$ 48,775

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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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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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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to nondeductible meal and entertainment expenses under enacted tax laws.

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The sum of other amounts reflected in the reconciliation of the statutory tax provision (benefit) to the actual tax provision (benefit).

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The sum of the differences between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to tax credits.

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