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Goodwill and Other Intangible Assets - Goodwill Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Balance at beginning of period $ 37,681 $ 34,428
Effect of change in foreign currency exchange rates (4,739) 3,253
Balance at end of period $ 32,942 $ 37,681