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Revenue - Timing of Transfer (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
Point in time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 110,220 | 152,338 | 206,218 | 261,059
Over time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 35,546 | 48,595 | 68,323 | 90,343
Rail Products and Services |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 74,939 | 101,401 | 145,143 | 177,095
Rail Products and Services | Point in time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 61,275 | 80,701 | 116,163 | 137,193
Rail Products and Services | Over time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 13,664 | 20,700 | 28,980 | 39,902
Construction Products |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 42,008 | 55,406 | 71,042 | 92,751
Construction Products | Point in time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 28,148 | 38,095 | 45,031 | 61,190
Construction Products | Over time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 13,860 | 17,311 | 26,011 | 31,561
Tubular and Energy Services |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 28,819 | 44,126 | 58,356 | 81,556
Tubular and Energy Services | Point in time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 20,797 | 33,542 | 45,024 | 62,676
Tubular and Energy Services | Over time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | $ 8,022 | $ 10,584 | $ 13,332 | $ 18,880

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