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Revenue (Tables)
 9 Months Ended
Sep. 30, 2019
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
September 30,		Nine Months Ended
September 30,
2019201820192018
Rail Products$39,224  $49,234  $153,420  $139,600  
Rail Technologies28,517  35,283  91,416  98,971  
Rail Products and Services67,741  84,517  244,836  238,571  
Piling and Fabricated Bridge28,703  26,798  90,023  71,505  
Precast Concrete Products18,472  14,736  49,903  41,136  
Construction Products47,175  41,534  139,926  112,641  
Test, Inspection, and Threading Services12,249  15,296  40,777  44,517  
Protective Coatings and Measurement Systems27,111  25,747  80,139  66,709  
Tubular and Energy Services39,360  41,043  120,916  111,226  
Total net sales$154,276  $167,094  $505,678  $462,438  
Net sales by the timing of the transfer of products and services was as follows:
Three Months Ended September 30, 2019
Rail Products and
Services		Construction
Products		Tubular and Energy
Services		Total
Point in time$46,712  $29,375  $26,670  $102,757  
Over time21,029  17,800  12,690  51,519  
Total net sales$67,741  $47,175  $39,360  $154,276  
Three Months Ended September 30, 2018
Rail Products and
Services		Construction
Products		Tubular and Energy
Services		Total
Point in time$61,426  $27,459  $33,474  $122,359  
Over time23,091  14,075  7,569  44,735  
Total net sales$84,517  $41,534  $41,043  $167,094  

Nine Months Ended September 30, 2019
Rail Products and
Services		Construction
Products		Tubular and Energy
Services		Total
Point in time$183,905  $90,565  $89,346  $363,816  
Over time60,931  49,361  31,570  141,862  
Total net sales$244,836  $139,926  $120,916  $505,678  
Nine Months Ended September 30, 2018
Rail Products and
Services		Construction
Products		Tubular and Energy
Services		Total
Point in time$176,592  $74,581  $94,832  $346,005  
Over time61,979  38,060  16,394  116,433  
Total net sales$238,571  $112,641  $111,226  $462,438