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Income Taxes (Summary of Company's Income Tax Provision and Effective Income Tax Rate) (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
Income before income taxes	$ 94,959	$ 50,527	$ 177,397	$ 92,510
Provision for income taxes	$ 27,263	$ 12,603	$ 49,802	$ 22,333
Effective income tax rate	28.70%	24.90%	28.10%	24.10%

- 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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