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Goodwill and Intangible Assets - Changes in Intangible Assets, Net of Accumulated Amortization (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Finite-lived Intangible Assets [Roll Forward]  
January 1, 2018 $ 183,088
Amortization expense (5,307)
Currency translation (1,181)
June 30, 2018 $ 176,600