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Restructuring - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]    
Restructuring liability, current $ 965 $ 964
Restructuring liability, noncurrent 400  
2015 Initiatives    
Restructuring Cost and Reserve [Line Items]    
Total expected cost 6,200  
2017 Initiatives    
Restructuring Cost and Reserve [Line Items]    
Total expected cost 4,400  
2018 Initiatives    
Restructuring Cost and Reserve [Line Items]    
Total expected cost $ 1,000