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Revenue (Timing of Transfer) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue |  |  |  |
Total net sales | $ 200,933 | $ 172,890 | $ 351,402 | $ 295,344
Point in time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 152,338 | 132,414 | 261,059 | 223,646
Over time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 48,595 | 40,476 | 90,343 | 71,698
Rail Products and Services |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 101,401 | 91,884 | 177,095 | 154,054
Rail Products and Services | Point in time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 80,701 | 69,295 | 137,193 | 115,166
Rail Products and Services | Over time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 20,700 | 22,589 | 39,902 | 38,888
Construction Products |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 55,406 | 42,207 | 92,751 | 71,107
Construction Products | Point in time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 38,095 | 28,196 | 61,190 | 47,122
Construction Products | Over time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 17,311 | 14,011 | 31,561 | 23,985
Tubular and Energy Services |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 44,126 | 38,799 | 81,556 | 70,183
Tubular and Energy Services | Point in time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | 33,542 | 34,923 | 62,676 | 61,358
Tubular and Energy Services | Over time |  |  |  |
Disaggregation of Revenue |  |  |  |
Total net sales | $ 10,584 | $ 3,876 | $ 18,880 | $ 8,825

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