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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table summarizes the Company's net sales by major product and service category:
|  |  |  |  |  | Year Ended December 31, |  |
|  |  |  |  |  | 2018 |  | 2017
Rail Products |  |  |  |  |  | $ | 188,590 |  | $ | 155,870
Rail Technologies |  |  |  |  |  | 130,934 |  | 100,257
Rail Products and Services |  |  |  |  |  | 319,524 |  | 256,127
Piling and Fabricated Bridge Products |  |  |  |  |  | 102,246 |  | 105,924
Precast Concrete Products |  |  |  |  |  | 56,407 |  | 55,877
Construction Products |  |  |  |  |  | 158,653 |  | 161,801
Test, Inspection, and Threading Services |  |  |  |  |  | 59,766 |  | 50,683
Protective Coatings and Measurement Systems |  |  |  |  |  | 89,026 |  | 67,766
Tubular and Energy Services |  |  |  |  |  | 148,792 |  | 118,449
Total net sales |  |  |  |  |  | $ | 626,969 |  | $ | 536,377
Net sales by the timing of the transfer of goods and services is as follows:
Year Ended December 31, 2018 |  | Rail Products and Services |  | Construction Products |  | Tubular and Energy Services |  | Total
Point in time |  | $ | 232,814 |  | $ | 106,168 |  | $ | 124,734 |  | $ | 463,716
Over time |  | 86,710 |  | 52,485 |  | 24,058 |  | 163,253
Total net sales |  | $ | 319,524 |  | $ | 158,653 |  | $ | 148,792 |  | $ | 626,969
Year Ended December 31, 2017 |  | Rail Products and Services |  | Construction Products |  | Tubular and Energy Services |  | Total
Point in time |  | $ | 205,942 |  | $ | 97,462 |  | $ | 99,635 |  | $ | 403,039
Over time |  | 50,185 |  | 64,339 |  | 18,814 |  | 133,338
Total net sales |  | $ | 256,127 |  | $ | 161,801 |  | $ | 118,449 |  | $ | 536,377

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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