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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 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Business Acquisitions [Abstract]                      
Net patient service revenue                 $ 1,673,979 $ 1,620,475  
Net income                 $ 227,333 [1] $ 237,078 [1]  
Net income per share, Basic                 $ 4.77 [2] $ 5.08 [2]  
Net income per share, Diluted                 $ 4.66 [2] $ 4.98 [2]  
Weighted average shares, Basic                 47,706 [2] 46,630 [2]  
Weighted average shares, Diluted                 48,796 [2] 47,570 [2]  
Effective tax rate                 38.29% [1] 34.86% [1] 38.89%
Effective tax rate prior years                   34.29%  
Basic weighted average shares outstanding 48,126 [3] 47,990 [3] 47,531 [3] 47,149 [3] 46,914 [3] 46,788 [3] 46,516 [3] 46,300 [3] 47,706 46,630 45,573
Diluted weighted average shares outstanding 49,132 [3] 48,935 [3] 48,730 [3] 48,361 [3] 47,998 [3] 47,482 [3] 47,528 [3] 47,267 [3] 48,796 47,570 46,471
[1] The comparison of net income is affected by the change in the effective tax rate. The effective tax rate was 38.29% for the year ended December 31, 2011 as compared to 34.29% for the year ended December 31, 2010.
[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 year ended December 31, 2011 were 47.7 million and 48.8 million, respectively, as compared to 46.6 million and 47.6 million, respectively, for the year ended December 31, 2010.
[3] Basic and diluted per share amounts are computed for each of the periods presented. Accordingly, the sum of the quarterly per share amounts may not agree with the full year amount.