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Restructuring Costs - Severance Obligation (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Restructuring Reserve [Roll Forward]    
Restructuring reserve, beginning balance $ 1,000 $ 0
Charges for employee severance, benefits and other 268 3,722
Payments (668) (2,164)
Foreign currency impact (19) 368
Restructuring reserve, ending balance $ 581 $ 1,926