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Business Acquisitions (Schedule Of Pro Forma Information That Combines The Consolidated Results Of Company And Business Acquisitions) (Details) (USD $) In Thousands, except Share data	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Business Acquisitions [Abstract]
Net patient service revenue	$ 1,206,979	$ 1,168,932
Net income	$ 163,469	$ 177,986
Net income per share, Basic	$ 3.44	$ 3.82
Net income per share, Diluted	$ 3.36	$ 3.75
Weighted average shares, Basic	47,564	46,535
Weighted average shares, Diluted	48,683	47,426

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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.

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

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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The weighted average number of shares or units and dilutive common stock or unit equivalents outstanding in the calculation of proforma diluted earnings per share (earnings per unit), which is commonly presented in initial public offerings based on the terms of the offering.

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