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Goodwill and Intangible Assets - Changes in Intangible Assets, Net of Accumulated Amortization (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Finite-lived Intangible Assets [Roll Forward]  
January 1, 2019 $ 169,515
Additions (Note 19) 11,000
Amortization expense (8,135)
Currency translation (1,314)
September 30, 2019 $ 171,066