Industry Segments - Schedule of reporting information by segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 141,703	$ 151,205
Operating Income	7,358	1,129
Interest expense, net	(1,975)	(2,019)
Income (loss) from continuing operations before income taxes	5,383	(890)
Operating Segments [Member] | Material Handling [Member]
Segment Reporting Information [Line Items]
Net sales	103,180	109,024
Operating Income	12,088	7,441
Operating Segments [Member] | Distribution [Member]
Segment Reporting Information [Line Items]
Net sales	38,574	42,221
Operating Income	1,538	2,536
Inter-company sales [Member]
Segment Reporting Information [Line Items]
Net sales	(51)	(40)
Corporate [Member]
Segment Reporting Information [Line Items]
Operating Income	$ (6,268)	$ (8,848)