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Revenue - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue |  |  |  |
Total net sales | $ 145,766 | $ 200,933 | $ 274,541 | $ 351,402
Rail Products and Services |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 74,939 | 101,401 | 145,143 | 177,095
Rail Products and Services | Rail Products |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 52,206 | 67,990 | 95,768 | 114,196
Rail Products and Services | Rail Technologies |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 22,733 | 33,411 | 49,375 | 62,899
Construction Products |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 42,008 | 55,406 | 71,042 | 92,751
Construction Products | Piling and Fabricated Bridge |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 25,580 | 37,588 | 43,971 | 61,320
Construction Products | Precast Concrete Products |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 16,428 | 17,818 | 27,071 | 31,431
Tubular and Energy Services |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 28,819 | 44,126 | 58,356 | 81,556
Tubular and Energy Services | Test, Inspection, and Threading Services |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 8,673 | 13,804 | 18,377 | 28,528
Tubular and Energy Services | Protective Coatings and Measurement Systems |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | $ 20,146 | $ 30,322 | $ 39,979 | $ 53,028

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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