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Business Acquisitions (Tables) | 12 Months Ended
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Dec. 31, 2011
Business Acquisitions [Abstract] |
Schedule Of Pro Forma Information That Combines The Consolidated Results Of Company And Business Acquisitions |
|  | Years Ended December 31, |
|  | 2011 |  |  | 2010 |
Net patient service revenue |  | $ | 1,673,979 |  |  | $ | 1,620,475 |
Net income (1) |  |  | 227,333 |  |  |  | 237,078 |
Net income per share (2): |  |  |  |  |  |  |  |
Basic |  | $ | 4.77 |  |  | $ | 5.08 |
Diluted |  | $ | 4.66 |  |  | $ | 4.98 |
Weighted average shares (2): |  |  |  |  |  |  |  |
Basic |  |  | 47,706 |  |  |  | 46,630 |
Diluted |  |  | 48,796 |  |  |  | 47,570 |
Effective tax rate (1): |  |  | 38.29 | % |  |  | 34.86 | %
(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.

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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 54 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 55 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph r(2, 3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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