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Business Segments (Reconciliation of Significant Reconciling Items) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 624,523 |  | $ 607,192 | $ 597,963
Assets | 566,660 |  | 491,717 | 413,193
Depreciation and amortization | 26,674 |  | 12,577 | 10,002
Expenditures for Long-Lived Assets | 15,201 |  | 19,037 | 9,674
Rail Products and Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 328,982 |  | 374,615 | 363,667
Segment Profit (Loss) | 27,037 |  | 30,093 | 28,692
Assets | 241,222 |  | 239,951 | 252,049
Depreciation and amortization | 8,098 |  | 6,153 | 6,505
Expenditures for Long-Lived Assets | 4,273 |  | 5,115 | 3,383
Construction Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 176,394 |  | 178,847 | 191,751
Segment Profit (Loss) | 12,958 |  | 13,106 | 10,206
Assets | 86,335 |  | 102,978 | 77,900
Depreciation and amortization | 2,720 |  | 2,232 | 1,758
Expenditures for Long-Lived Assets | 1,260 |  | 3,343 | 1,805
Tubular and Energy Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 119,147 |  | 53,730 | 42,545
Segment Profit (Loss) | (81,344) | [1] | 5,350 | 9,208
Assets | 216,715 |  | 130,289 | 51,497
Depreciation and amortization | 14,857 |  | 3,208 | 1,054
Expenditures for Long-Lived Assets | 4,303 |  | 6,988 | 2,460
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 624,523 |  | 607,192 | 597,963
Segment Profit (Loss) | (41,349) |  | 48,549 | 48,106
Assets | 544,272 |  | 473,218 | 381,446
Depreciation and amortization | 25,675 |  | 11,593 | 9,317
Expenditures for Long-Lived Assets | $ 9,836 |  | $ 15,446 | $ 7,648
[1] | Segment loss includes impairment of goodwill as further described in Note 4.

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