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Acquisitions (Summary of Acquisitions) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Business Combinations [Abstract]    
Cash paid, net of cash acquired $ 400,558 $ 199,435
Equity securities issued 2,137 $ 0
Debt issued 1,748  
Consideration $ 404,443