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Revenue - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue |  |  |  |
Total net sales | $ 118,365 | $ 144,848 | $ 381,835 | $ 475,097
Point in time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 80,249 | 93,329 | 275,396 | 333,235
Over time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 38,116 | 51,519 | 106,439 | 141,862
Rail Products and Services |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 63,988 | 67,741 | 209,131 | 244,836
Rail Products and Services | Point in time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 47,027 | 46,712 | 163,190 | 183,905
Rail Products and Services | Over time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 16,961 | 21,029 | 45,941 | 60,931
Rail Products and Services | Rail Products |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 38,057 | 39,224 | 133,825 | 153,420
Rail Products and Services | Rail Technologies |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 25,931 | 28,517 | 75,306 | 91,416
Construction Products |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 37,883 | 47,175 | 108,925 | 139,926
Construction Products | Point in time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 22,928 | 29,375 | 67,959 | 90,565
Construction Products | Over time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 14,955 | 17,800 | 40,966 | 49,361
Construction Products | Piling and Fabricated Bridge |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 22,138 | 28,703 | 66,109 | 90,023
Construction Products | Precast Concrete Products |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 15,745 | 18,472 | 42,816 | 49,903
Construction Products | Construction Products |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 37,883 | 47,175 | 108,925 | 139,926
Tubular and Energy Services |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 16,494 | 29,932 | 63,779 | 90,335
Tubular and Energy Services | Point in time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 10,294 | 17,242 | 44,247 | 58,765
Tubular and Energy Services | Over time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 6,200 | 12,690 | 19,532 | 31,570
Tubular and Energy Services | Threaded Products |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 3,524 | 2,821 | 10,830 | 10,196
Tubular and Energy Services | Protective Coatings and Measurement Systems |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | $ 12,970 | $ 27,111 | $ 52,949 | $ 80,139

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