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Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Details)
$ in Thousands
3 Months Ended
Sep. 30, 2018
USD ($)
Goodwill [Roll Forward]  
Goodwill as of June 30, 2018 $ 32,230
Effect of foreign currency changes on goodwill (169)
Goodwill as of September 30, 2018 $ 32,061