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Restructuring - Components of Restructuring Activities (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Restructuring Reserve [Roll Forward]  
Accrual balance at December 31, 2018 $ 0
Restructuring charges 4,050
Cash payments 0
Accrual balance at June 30, 2019 4,050
Employee separations  
Restructuring Reserve [Roll Forward]  
Accrual balance at December 31, 2018 0
Restructuring charges 1,364
Cash payments 0
Accrual balance at June 30, 2019 1,364
Facility exit costs  
Restructuring Reserve [Roll Forward]  
Accrual balance at December 31, 2018 0
Restructuring charges 2,686
Cash payments 0
Accrual balance at June 30, 2019 $ 2,686