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Acquisitions - Changes in Fair Value of Contingent Consideration (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Contingent Consideration        
Balance, June 30, 2018 $ 10,097      
Measurement period adjustment 6,177      
Fair value adjustment 412 $ 0 $ 412 $ 0
Foreign currency translation (298)      
Balance, September 30, 2018 $ 16,388   $ 16,388