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Goodwill and Intangible Assets - Changes in Intangible Assets, Net of Accumulated Amortization (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Finite-lived Intangible Assets [Roll Forward]  
January 1, 2019 $ 169,515
Amortization expense (2,613)
Currency translation 1,148
March 31, 2019 $ 168,050