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Business Segments - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information |  |  |  |
Total net sales | $ 118,365 | $ 144,848 | $ 381,835 | $ 475,097
Segment profit (loss) | 6,117 | 8,970 |  |
Interest expense - net | (940) | (1,078) | (2,841) | (4,030)
Other (expense) income - net | 209 | 374 | 1,909 | 764
Pre-tax income | 2,836 | 4,590 | 11,845 | 21,656
Rail Products and Services |  |  |  |
Segment Reporting Information |  |  |  |
Total net sales | 63,988 | 67,741 | 209,131 | 244,836
Segment profit (loss) | 3,742 | 3,417 |  |
Construction Products |  |  |  |
Segment Reporting Information |  |  |  |
Total net sales | 37,883 | 47,175 | 108,925 | 139,926
Segment profit (loss) | 1,756 | 1,848 |  |
Tubular and Energy Services |  |  |  |
Segment Reporting Information |  |  |  |
Total net sales | 16,494 | 29,932 | 63,779 | 90,335
Segment profit (loss) | 619 | 3,705 |  |
Operating Segments |  |  |  |
Segment Reporting Information |  |  |  |
Total net sales |  |  | 381,835 | 475,097
Segment profit (loss) | 6,117 | 8,970 | 19,565 | 35,811
Interest expense - net | (940) | (1,078) | (2,841) | (4,030)
Other (expense) income - net | (243) | 374 | 2,178 | 764
Unallocated corporate expenses and other unallocated charges | (2,098) | (3,676) | (7,057) | (10,889)
Pre-tax income | $ 2,836 | $ 4,590 | 11,845 | 21,656
Operating Segments | Rail Products and Services |  |  |  |
Segment Reporting Information |  |  |  |
Total net sales |  |  | 209,131 | 244,836
Segment profit (loss) |  |  | 10,729 | 14,815
Operating Segments | Construction Products |  |  |  |
Segment Reporting Information |  |  |  |
Total net sales |  |  | 108,925 | 139,926
Segment profit (loss) |  |  | 1,623 | 6,095
Operating Segments | Tubular and Energy Services |  |  |  |
Segment Reporting Information |  |  |  |
Total net sales |  |  | 63,779 | 90,335
Segment profit (loss) |  |  | $ 7,213 | $ 14,901

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