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Restructuring - Summary of Restructuring Liability (Details) - 2015 Initiatives
$ in Thousands
 6 Months Ended
Jun. 30, 2019
USD ($)
Restructuring Reserve [Roll Forward]  
Balance at December 31, 2018 $ 634
Costs Incurred 37
Payments (235)
Balance at June 30, 2019 436
Cumulative Costs Incurred to Date 6,010
Employee Severance Costs  
Restructuring Reserve [Roll Forward]  
Balance at December 31, 2018 0
Costs Incurred 0
Payments 0
Balance at June 30, 2019 0
Cumulative Costs Incurred to Date 4,131
Facility Exit Related Costs  
Restructuring Reserve [Roll Forward]  
Balance at December 31, 2018 634
Costs Incurred 37
Payments (235)
Balance at June 30, 2019 436
Cumulative Costs Incurred to Date $ 1,879