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Restructuring - Summary of Activities in the Restructuring Accruals (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring Reserve [Roll Forward]    
Beginning balance $ 227 $ 1,793
Charges during the period 628 284
Cash payments during the period (96) (353)
Currency (4) 2
Ending balance $ 755 $ 1,726