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Goodwill and Intangible Assets - Changes in Goodwill (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Goodwill [Roll Forward]  
January 1, 2019 $ 413,640
Additions (Note 19) 19,766
Currency translation (4,777)
September 30, 2019 $ 428,629