Revenue (Tables)

3 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table summarizes the Company's net sales by major product and service category:

	Three Months Ended March 31,
	2020		2019
Rail Products	$	43,562	$	46,206
Rail Technologies	26,642		29,488
Rail Products and Services	70,204		75,694
Piling and Fabricated Bridge	18,391		23,732
Precast Concrete Products	10,643		13,613
Construction Products	29,034		37,345
Test, Inspection, and Threading Services	9,704		14,724
Protective Coatings and Measurement Systems	19,833		22,706
Tubular and Energy Services	29,537		37,430
Total net sales	$	128,775	$	150,469

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

	Three Months Ended March 31, 2020
	Rail Products and Services		Construction Products		Tubular and Energy Services		Total
Point in time	$	54,888	$	16,883	$	24,227	$	95,998
Over time	15,316		12,151		5,310		32,777
Total net sales	$	70,204	$	29,034	$	29,537	$	128,775
	Three Months Ended March 31, 2019
	Rail Products and Services		Construction Products		Tubular and Energy Services		Total
Point in time	$	56,492	$	23,095	$	29,134	$	108,721
Over time	19,202		14,250		8,296		41,748
Total net sales	$	75,694	$	37,345	$	37,430	$	150,469