Restructuring - Restructuring Charges by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 119	$ 7,553	$ 0
Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	119	7,389	0
SG&A [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	164	0
Distribution [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	0	0
Distribution [Member] | Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	0	0
Distribution [Member] | SG&A [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	0	0
Material Handling [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	119	7,553	0
Material Handling [Member] | Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	119	7,389	0
Material Handling [Member] | SG&A [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	164	0
Corporate [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	0	0
Corporate [Member] | Cost of Sales [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	0	0
Corporate [Member] | SG&A [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 0	$ 0	$ 0