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Income Taxes (Summary Of Income Tax Provision And Effective Tax Rate For Continuing Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income Taxes [Abstract]
Pretax income	$ 46,864	$ 110,877
Provision for income taxes	$ 431	$ 40,282
Effective tax rate	0.90%	36.30%

- 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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