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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