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Restructuring - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Restructuring liability, current $ 400   $ 400  
Restructuring liability, noncurrent 300   300  
Impairment of abandoned product line, net of recoveries 0 $ 82 355 $ 1,489
2015 Initiatives        
Restructuring Cost and Reserve [Line Items]        
Total expected cost 6,100   6,100  
2017 Initiatives        
Restructuring Cost and Reserve [Line Items]        
Total expected cost 4,400   4,400  
2018 Initiatives        
Restructuring Cost and Reserve [Line Items]        
Total expected cost $ 1,000   $ 1,000