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Acquisitions (Fair Value Of Total Consideration Transferred And Major Class Of Consideration) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Business Acquisition [Line Items]      
Goodwill $ 3,586,021 $ 3,381,149  
Series of Individually Immaterial Business Acquisitions [Member]      
Business Acquisition [Line Items]      
Accounts receivable 14,162 [1]   $ 1,023
Other current assets 7,882 [1]   953
Property and equipment 6,774 [1]   2,481
Goodwill 220,952 [1]   44,319
Intangible assets 32,313 [1]   0
Other long-term assets 40 [1]   0
Accounts payable (2,234) [1]   (2,341)
Other accrued liabilities (9,979) [1]   (527)
Deferred income taxes (3,604) [1]   0
Other long-term liabilities (4,302) [1]   0
Long-term debt (583) [1]   (214)
Total fair value 261,421 [1]   45,694
Less: Fair value attributable to noncontrolling interests 59,889 [1]   21,257
Acquisition date fair value of total consideration transferred $ 201,532 [1]   $ 24,437
[1] Represents the preliminary allocation of fair value of acquired assets and liabilities associated with these acquisitions at June 30, 2015.