Revenue (Tables)

9 Months Ended

Sep. 30, 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 for the periods presented:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Rail Products	$	38,057	$	39,224	$	133,825	$	153,420
Rail Technologies	25,931		28,517		75,306		91,416
Rail Products and Services	63,988		67,741		209,131		244,836
Piling and Fabricated Bridge	22,138		28,703		66,109		90,023
Precast Concrete Products	15,745		18,472		42,816		49,903
Construction Products	37,883		47,175		108,925		139,926
Threaded Products	3,524		2,821		10,830		10,196
Protective Coatings and Measurement Systems	12,970		27,111		52,949		80,139
Tubular and Energy Services	16,494		29,932		63,779		90,335
Total net sales	$	118,365	$	144,848	$	381,835	$	475,097

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

	Three Months Ended September 30, 2020
	Rail Products and Services		Construction Products		Tubular and Energy Services		Total
Point in time	$	47,027	$	22,928	$	10,294	$	80,249
Over time	16,961		14,955		6,200		38,116
Total net sales	$	63,988	$	37,883	$	16,494	$	118,365
	Three Months Ended September 30, 2019
	Rail Products and Services		Construction Products		Tubular and Energy Services		Total
Point in time	$	46,712	$	29,375	$	17,242	$	93,329
Over time	21,029		17,800		12,690		51,519
Total net sales	$	67,741	$	47,175	$	29,932	$	144,848