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Acquisitions (Pro Forma Consolidated Results Of Operation) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	9 Months Ended
	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Acquisitions [Abstract]
Revenue	$ 664,651	$ 2,183,745	$ 1,876,006
Net income	$ 13,653	$ 41,976	$ 32,458
Basic	$ 0.37	$ 1.14	$ 0.87
Diluted	$ 0.37	$ 1.13	$ 0.87

X

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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