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Business Combinations (Schedule of Business Acquisitions) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Apr. 20, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 705,382   $ 695,158
Levity [Member]      
Business Acquisition [Line Items]      
Cash paid for controlling interest   $ 48,350  
Redeemable noncontrolling interest   30,573  
Cash   13,471  
Other current assets   17,251  
Property and equipment   20,663  
Intangible assets   46,413  
Other noncurrent assets   3,306  
Current liabilities   (23,647)  
Noncurrent liabilities   (21,394)  
Noncontrolling interests acquired   (1,354)  
Fair value of net assets acquired   54,709  
Goodwill   24,214  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net   $ 78,923