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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
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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.

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