Revenue (Tables)

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table summarizes the Company’s net sales by major product and service category for the periods presented:

	Three Months Ended March 31,
	2021		2020
Rail Products	$	43,810	$	47,899
Rail Technologies	22,422		22,305
Rail Technologies and Services	66,232		70,204
Fabricated Steel Products	27,721		18,391
Precast Concrete Products	12,678		10,643
Coatings and Measurement	9,449		22,669
Infrastructure Solutions	49,848		51,703
Total net sales	$	116,080	$	121,907

Net sales by the timing of the transfer of products and services was as follows for the periods presented:

	Three Months Ended March 31, 2021
	Rail Technologies and Services		Infrastructure Solutions		Total
Point in time	$	52,044	$	34,664	$	86,708
Over time	14,188		15,184		29,372
Total net sales	$	66,232	$	49,848	$	116,080
	Three Months Ended March 31, 2020
	Rail Technologies and Services		Infrastructure Solutions		Total
Point in time	$	54,888	$	34,242	$	89,130
Over time	15,316		17,461		32,777
Total net sales	$	70,204	$	51,703	$	121,907