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Income Taxes (Schedule Of Provision For Income Taxes And Effective Tax Rates) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Income Taxes
Provision for income taxes	$ 14,342	$ 10,310	$ 28,338	$ 19,449
Effective tax rate	29.20%	32.10%	31.50%	31.30%

- 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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