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Goodwill and Intangible Assets - Goodwill (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Goodwill [Roll Forward]  
Goodwill balance at January 1 $ 238,147
Effect of foreign exchange 591
Additions as the result of acquisitions 5,387
Goodwill balance at March 31 $ 244,125