Restructuring - Restructuring Charges by Segment (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 901	$ 119
Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	119
SG&A [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	901	0
Distribution [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	901	0
Distribution [Member] | Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	0
Distribution [Member] | SG&A [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	901	0
Material Handling [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	119
Material Handling [Member] | Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	119
Material Handling [Member] | SG&A [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 0	$ 0