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Income Taxes (Schedule Of Effective Tax Rates Calculation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Provision for income taxes	$ 247,466	$ 152,302	$ 170,475
Income before income taxes	$ 696,336	$ 428,097	$ 474,722
Effective tax rate	35.50%	35.60%	35.90%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- 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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