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Acquisitions (Summary of Acquisitions) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]    
Cash paid, net of cash acquired $ 374,026 $ 400,558
2018 Acquisitions    
Business Acquisition [Line Items]    
Cash paid, net of cash acquired 374,026  
Debt issued 125,055  
Total consideration $ 499,081