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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 Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Business Acquisitions [Abstract]    
Net patient service revenue $ 426,666 $ 416,374
Net income $ 48,837 [1] $ 49,287 [1]
Net income per share, Basic $ 1.01 [2] $ 1.05 [2]
Net income per share, Diluted $ 0.99 [2] $ 1.02 [2]
Weighted average shares, Basic 48,269 [2] 47,149 [2]
Weighted average shares, Diluted 49,399 [2] 48,361 [2]
Effective tax rate 39.00% [1] 39.50% [1]
Basic weighted average shares outstanding 48,269 47,149
Diluted weighted average shares outstanding 49,399 48,361
[1] The comparison of net income is affected by the change in the effective tax rate. The effective tax rate was 39.0% for the three months ended March 31, 2012 as compared to 39.5% for the three months ended March 31, 2011.
[2] The comparison of net income per share is affected by the changes in the number of weighted average shares outstanding in each period. The basic and diluted weighted average shares outstanding for the three months ended March 31, 2012 were 48.3 million and 49.4 million, respectively, as compared to 47.1 million and 48.4 million, respectively, for the three months ended March 31, 2011.