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Acquisitions (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
physician_practice
center
Mar. 31, 2015
USD ($)
physician_practice
center
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]      
Acquisitions and related expenses, net $ 2,990 $ 126,578  
Transaction costs 1,390 1,471  
Ambulatory Services [Member]      
Business Acquisition [Line Items]      
Acquisitions and related expenses, net $ 0 $ 41,900  
Ambulatory Services [Member] | Controlling Interest [Member]      
Business Acquisition [Line Items]      
Number of business acquisitions | center 0 1  
Physician Services [Member] | Series of Individually Immaterial Business Acquisitions [Member]      
Business Acquisition [Line Items]      
Number of business acquisitions | physician_practice 1 3  
Cash paid to acquire business $ 3,000 $ 84,700  
Accrued liability, contingent consideration 5,500   $ 5,500
Contingent consideration arrangements, low 5,000    
Contingent consideration arrangements, high $ 6,000