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Goodwill and Intangible Assets - Changes in Goodwill (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill, Impairment Loss $ (525)
Goodwill [Roll Forward]  
January 1, 2018 422,185
Currency translation (3,276)
June 30, 2018 $ 418,384