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Goodwill and Intangible Assets - Goodwill (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Goodwill [Roll Forward]  
Goodwill balance at January 1 $ 211,927
Effect of foreign exchange 1,686
Additions as the result of acquisitions 13,216
Goodwill balance at June 30 $ 226,829