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Business Segments - Reconciliation of Revenue from Segments to Consolidated (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
Segment Reporting Information |  |  |  |  |  |  |  |  |  |
Net Sales | $ 149,379 | $ 154,276 | $ 200,933 | $ 150,469 | $ 164,531 | $ 167,094 | $ 172,890 | $ 122,454 | $ 655,057 | $ 626,969
Segment Profit |  |  |  |  |  |  |  |  | 36,514 | 38,913
Segment Assets | 405,171 |  |  |  | 383,249 |  |  |  | 405,171 | 383,249
Depreciation/Amortization |  |  |  |  |  |  |  |  | 17,631 | 18,593
Expenditures for Long-Lived Assets |  |  |  |  |  |  |  |  | 8,831 | 5,251
Rail Products and Services |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 321,808 | 319,524
Construction Products |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 182,486 | 158,653
Tubular and Energy Services |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 150,763 | 148,792
Operating Segments |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 655,057 | 626,969
Segment Profit |  |  |  |  |  |  |  |  | 36,514 | 38,913
Segment Assets | 346,692 |  |  |  | 363,239 |  |  |  | 346,692 | 363,239
Depreciation/Amortization |  |  |  |  |  |  |  |  | 16,303 | 17,328
Expenditures for Long-Lived Assets |  |  |  |  |  |  |  |  | 8,479 | 4,949
Operating Segments | Rail Products and Services |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 321,808 | 319,524
Segment Profit |  |  |  |  |  |  |  |  | 19,641 | 19,468
Segment Assets | 186,323 |  |  |  | 175,704 |  |  |  | 186,323 | 175,704
Depreciation/Amortization |  |  |  |  |  |  |  |  | 6,469 | 6,810
Expenditures for Long-Lived Assets |  |  |  |  |  |  |  |  | 2,293 | 941
Operating Segments | Construction Products |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 182,486 | 158,653
Segment Profit |  |  |  |  |  |  |  |  | 5,726 | 6,798
Segment Assets | 83,049 |  |  |  | 97,133 |  |  |  | 83,049 | 97,133
Depreciation/Amortization |  |  |  |  |  |  |  |  | 1,660 | 1,728
Expenditures for Long-Lived Assets |  |  |  |  |  |  |  |  | 1,266 | 796
Operating Segments | Tubular and Energy Services |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 150,763 | 148,792
Segment Profit |  |  |  |  |  |  |  |  | 11,147 | 12,647
Segment Assets | $ 77,320 |  |  |  | $ 90,402 |  |  |  | 77,320 | 90,402
Depreciation/Amortization |  |  |  |  |  |  |  |  | 8,174 | 8,790
Expenditures for Long-Lived Assets |  |  |  |  |  |  |  |  | $ 4,920 | $ 3,212

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