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Revenue (Timing of Transfer) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue |  |
Total net sales | $ 626,969 | $ 536,377
Point in time |  |
Disaggregation of Revenue |  |
Total net sales | 463,716 | 403,039
Over time |  |
Disaggregation of Revenue |  |
Total net sales | 163,253 | 133,338
Rail Products and Services |  |
Disaggregation of Revenue |  |
Total net sales | 319,524 | 256,127
Rail Products and Services | Point in time |  |
Disaggregation of Revenue |  |
Total net sales | 232,814 | 205,942
Rail Products and Services | Over time |  |
Disaggregation of Revenue |  |
Total net sales | 86,710 | 50,185
Construction Products |  |
Disaggregation of Revenue |  |
Total net sales | 158,653 | 161,801
Construction Products | Point in time |  |
Disaggregation of Revenue |  |
Total net sales | 106,168 | 97,462
Construction Products | Over time |  |
Disaggregation of Revenue |  |
Total net sales | 52,485 | 64,339
Tubular and Energy Services |  |
Disaggregation of Revenue |  |
Total net sales | 148,792 | 118,449
Tubular and Energy Services | Point in time |  |
Disaggregation of Revenue |  |
Total net sales | 124,734 | 99,635
Tubular and Energy Services | Over time |  |
Disaggregation of Revenue |  |
Total net sales | $ 24,058 | $ 18,814

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