Segments - Schedule of reporting information by segment (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Net sales		$ 228,065	$ 200,058	$ 686,707	$ 561,856
Total operating income		19,897	11,817	66,919	38,551
Interest expense, net		(1,719)	(1,056)	(4,077)	(3,050)
Income before income taxes		18,178	10,761	62,842	35,501
Operating Segments [Member] | Material Handling [Member]
Segment Reporting Information [Line Items]
Net sales		155,658	149,664	505,384	416,784
Total operating income	[1]	23,962	15,066	83,216	49,895
Operating Segments [Member] | Distribution [Member]
Segment Reporting Information [Line Items]
Net sales		72,416	50,413	181,352	145,119
Total operating income	[2]	4,899	4,377	12,469	10,029
Inter-company sales [Member]
Segment Reporting Information [Line Items]
Net sales		(9)	(19)	(29)	(47)
Corporate [Member]
Segment Reporting Information [Line Items]
Total operating income	[2],[3]	$ (8,964)	$ (7,626)	$ (28,766)	$ (21,373)

[1] In the nine months ended September 30, 2021, the Company recognized a $1.0 million gain on the sale of a building within the Material Handling Segment as described in Note 4.

[2] In the nine months ended September 30, 2021, the Company recognized $0.8 million of executive severance, of which $0.5 million was recognized in the Distribution Segment and $0.3 million was recognized in Corporate. This executive severance cost includes $0.5 million of severance and benefits and $0.3 million of charges for acceleration of stock compensation.

[3] In the quarter and nine months ended September 30, 2022, the Company recognized $1.5 million and $2.8 million, respectively, of charges to increase the estimated environmental liability as described in Note 10. Environmental charges are not included in segment results and are shown with Corporate.