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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Goodwill, beginning balance $ 632,370
Foreign currency translation (2,774)
Goodwill, ending balance $ 629,596