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Restructuring - Summary of Restructuring Liability (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Restructuring Reserve [Roll Forward]  
Balance at December 31, 2018 $ 634
Costs Incurred 22
Payments (119)
Balance at March 31, 2019 537
Cumulative Costs Incurred to Date 5,995
2015 Initiatives | Employee Severance Costs  
Restructuring Reserve [Roll Forward]  
Balance at December 31, 2018 0
Costs Incurred 0
Payments 0
Balance at March 31, 2019 0
Cumulative Costs Incurred to Date 4,131
2015 Initiatives | Facility Exit Related Costs  
Restructuring Reserve [Roll Forward]  
Balance at December 31, 2018 634
Costs Incurred 22
Payments (119)
Balance at March 31, 2019 537
Cumulative Costs Incurred to Date $ 1,864