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Business Segments (Reconciliation of Revenue from Segments to Consolidated) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information |  |
Net Sales | $ 626,969 | $ 536,377
Segment Profit | 38,913 | 28,601
Assets | 383,249 | 401,743
Depreciation/Amortization | 18,593 | 19,841
Expenditures for Long-Lived Assets | 5,251 | 6,149
Rail Products and Services |  |
Segment Reporting Information |  |
Net Sales | 319,524 | 256,127
Construction Products |  |
Segment Reporting Information |  |
Net Sales | 158,653 | 161,801
Tubular and Energy Services |  |
Segment Reporting Information |  |
Net Sales | 148,792 | 118,449
Operating Segments |  |
Segment Reporting Information |  |
Net Sales | 626,969 | 536,377
Segment Profit | 38,913 | 28,601
Assets | 363,239 | 375,898
Depreciation/Amortization | 17,328 | 18,369
Expenditures for Long-Lived Assets | 4,949 | 5,587
Operating Segments | Rail Products and Services |  |
Segment Reporting Information |  |
Net Sales | 319,524 | 256,127
Segment Profit | 19,468 | 11,078
Assets | 175,704 | 192,038
Depreciation/Amortization | 6,810 | 7,004
Expenditures for Long-Lived Assets | 941 | 2,915
Operating Segments | Construction Products |  |
Segment Reporting Information |  |
Net Sales | 158,653 | 161,801
Segment Profit | 6,798 | 14,040
Assets | 97,133 | 83,154
Depreciation/Amortization | 1,728 | 1,955
Expenditures for Long-Lived Assets | 796 | 1,390
Operating Segments | Tubular and Energy Services |  |
Segment Reporting Information |  |
Net Sales | 148,792 | 118,449
Segment Profit | 12,647 | 3,483
Assets | 90,402 | 100,706
Depreciation/Amortization | 8,790 | 9,410
Expenditures for Long-Lived Assets | $ 3,212 | $ 1,282

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