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Business Acquisitions (Narrative) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 years | Dec. 31, 2010
Business Acquisition [Line Items] |  |
Number of physician group practices acquired | 10 | 15
Business acquisition, total consideration | $ 159,500,000 | $ 339,300,000
Cash consideration | 146,500,000 | 328,700,000
Contingent consideration | 13,000,000 | 10,600,000
Goodwill recorded in connection with acquisitions | 138,600,000 | 317,500,000
Additional intangible assets | 22,500,000 |
Fixed assets | 400,000 |
Other liabilities | 2,000,000 |
Time period for achievement of certain performance measures for payment of contingent consideration, years | 5 |
Assumed payment probability of contingent consideration payment | 100.00% |
Range of the undiscounted amount under contingent consideration agreement, low | 0 |
Range of the undiscounted amount under contingent consideration agreement, high | 14,400,000 |
Contingent consideration payments related to prior-period acquisitions | 42,900,000 |
Payments due on contingent purchase price provisions | 2016 |
Maximum [Member] |  |
Business Acquisition [Line Items] |  |
Assumed discount rates for acquisition-date fair value | 6.00% |
Eligibility criteria for payments of contingent purchase price (in years) | 5 |
Minimum [Member] |  |
Business Acquisition [Line Items] |  |
Assumed discount rates for acquisition-date fair value | 3.00% |
Eligibility criteria for payments of contingent purchase price (in years) | 3 |
Prior-Period Acquisitions [Member] |  |
Business Acquisition [Line Items] |  |
Contingent consideration | 33,700,000 |
Additional intangible assets | 1,300,000 | 21,400,000
Fixed assets | 1,000,000 | 900,000
Other liabilities | 800,000 | 500,000
Contingent consideration payments related to prior-period acquisitions | $ 16,200,000 | $ 7,900,000

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