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Restructuring - Summary of Restructuring Liability (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
USD ($)
Restructuring Reserve [Roll Forward]  
Balance at December 31, 2017 $ 1,534
Costs Incurred 920
Payments (1,096)
Translation Adjustment 2
Balance at June 30, 2018 1,360
Cumulative Costs Incurred to Date 11,068
2015 Initiatives | Employee Severance Costs  
Restructuring Reserve [Roll Forward]  
Balance at December 31, 2017 0
Costs Incurred 0
Payments 0
Translation Adjustment 0
Balance at June 30, 2018 0
Cumulative Costs Incurred to Date 4,131
2015 Initiatives | Facility Exit Related Costs  
Restructuring Reserve [Roll Forward]  
Balance at December 31, 2017 981
Costs Incurred 63
Payments (230)
Translation Adjustment 0
Balance at June 30, 2018 814
Cumulative Costs Incurred to Date 1,791
2017 Initiatives | Employee Severance Costs  
Restructuring Reserve [Roll Forward]  
Balance at December 31, 2017 287
Costs Incurred 61
Payments (359)
Translation Adjustment 11
Balance at June 30, 2018 0
Cumulative Costs Incurred to Date 3,412
2017 Initiatives | Facility Exit Related Costs  
Restructuring Reserve [Roll Forward]  
Balance at December 31, 2017 106
Costs Incurred 2
Payments (108)
Translation Adjustment 0
Balance at June 30, 2018 0
Cumulative Costs Incurred to Date 285
2017 Initiatives | Other Related Costs  
Restructuring Reserve [Roll Forward]  
Balance at December 31, 2017 160
Costs Incurred 20
Payments (180)
Translation Adjustment 0
Balance at June 30, 2018 0
Cumulative Costs Incurred to Date 675
2018 Initiatives | Employee Severance Costs  
Restructuring Reserve [Roll Forward]  
Balance at December 31, 2017 0
Costs Incurred 774
Payments (219)
Translation Adjustment (9)
Balance at June 30, 2018 546
Cumulative Costs Incurred to Date $ 774