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Acquisitions (Fair Value Of Total Consideration Transferred And Major Class Of Consideration) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Goodwill $ 3,589,317 $ 3,381,149
Series of Individually Immaterial Business Acquisitions [Member]    
Business Acquisition [Line Items]    
Accounts receivable [1] 17,560  
Other current assets [1] 9,387  
Property and equipment [1] 10,679  
Goodwill [1] 255,251  
Intangible assets [1] 45,600  
Other long-term assets [1] 40  
Accounts payable [1] (2,718)  
Other accrued liabilities [1] (11,600)  
Deferred income taxes [1] (3,726)  
Other long-term liabilities [1] (4,957)  
Long-term debt [1] (3,928)  
Total fair value [1] 311,588  
Less: Fair value attributable to noncontrolling interests [1] 72,598  
Acquisition date fair value of total consideration transferred [1] $ 238,990  
[1] Represents the preliminary allocation of fair value of acquired assets and liabilities associated with these acquisitions at September 30, 2015.