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Revenue - Timing of Transfer (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales | $ 149,379 | $ 154,276 | $ 200,933 | $ 150,469 | $ 164,531 | $ 167,094 | $ 172,890 | $ 122,454 | $ 655,057 | $ 626,969
Point in time |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 468,282 | 463,716
Over time |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 186,775 | 163,253
Rail Products and Services |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 321,808 | 319,524
Rail Products and Services | Point in time |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 240,047 | 232,814
Rail Products and Services | Over time |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 81,761 | 86,710
Construction Products |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 182,486 | 158,653
Construction Products | Point in time |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 115,590 | 106,168
Construction Products | Over time |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 66,896 | 52,485
Tubular and Energy Services |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 150,763 | 148,792
Tubular and Energy Services | Point in time |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 112,645 | 124,734
Tubular and Energy Services | Over time |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | $ 38,118 | $ 24,058

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