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Income Taxes (Reconciliation Of Effective Tax Rate) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Computed "expected" tax expense	$ 101,620	$ 104,473	$ 78,185
State income taxes, net of federal income tax benefit	8,019	8,151	4,760
Permanent differences	5,593	5,183	6,180
Foreign	14	0	0
Other	(2,164)	(888)	(1,834)
Total income tax expense	$ 113,082	$ 116,919	$ 87,291

- 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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