Revenue (Tables)

6 Months Ended

Jun. 30, 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 June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Rail Products	$	64,565	$	56,500	$	108,375	$	104,399
Rail Technologies	24,217		18,439		46,639		40,744
Rail Technologies and Services	88,782		74,939		155,014		145,143
Fabricated Steel Products	32,223		25,580		59,944		43,971
Precast Concrete Products	20,073		16,428		32,751		27,071
Coatings and Measurement	13,444		24,616		22,893		47,285
Infrastructure Solutions	65,740		66,624		115,588		118,327
Total net sales	$	154,522	$	141,563	$	270,602	$	263,470

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

	Three Months Ended June 30, 2021
	Rail Technologies and Services		Infrastructure Solutions		Total
Point in time	$	71,711	$	39,637	$	111,348
Over time	17,071		26,103		43,174
Total net sales	$	88,782	$	65,740	$	154,522
	Three Months Ended June 30, 2020
	Rail Technologies and Services		Infrastructure Solutions		Total
Point in time	$	61,275	$	44,742	$	106,017
Over time	13,664		21,882		35,546
Total net sales	$	74,939	$	66,624	$	141,563

	Six Months Ended June 30, 2021
	Rail Technologies and Services		Infrastructure Solutions		Total
Point in time	$	123,755	$	74,301	$	198,056
Over time	31,259		41,287		72,546
Total net sales	$	155,014	$	115,588	$	270,602
	Six Months Ended June 30, 2020
	Rail Technologies and Services		Infrastructure Solutions		Total
Point in time	$	116,163	$	78,984	$	195,147
Over time	28,980		39,343		68,323
Total net sales	$	145,143	$	118,327	$	263,470