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Business Segments (Schedule Of Reporting Sement Data To Consolidated Totals From Continuing Ops) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Equity in loss of nonconsolidated investment | $ (1,290) | $ (413) | $ 1,282
Income (loss) from continuing operations, before income taxes | (147,169) | (50,577) | 39,060
Assets | 393,023 | 566,660 | 491,717
Depreciation and amortization | 23,492 | 26,674 | 12,577
Expenditures for Long-Lived Assets | 7,664 | 15,201 | 19,037
Net sales | 483,514 | 624,523 | 607,192
Long-lived assets of continuing operating activities | 103,973 | 126,745 | 74,802
Payments to Acquire Property, Plant, and Equipment | 7,664 | 14,913 | 17,056
Rail distribution products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 90,469 | 98,237 | 109,053
Rail Technologies products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 83,236 | 126,277 | 139,529
Piling Products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 70,535 | 94,853 | 111,182
Concrete products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 54,514 | 52,044 | 36,396
Test and inspection services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 42,830 | 36,048 | 0
CXT concrete tie products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 24,102 | 35,155 | 45,008
Allegheny Rail Products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 20,765 | 35,906 | 0
Other products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 80,775 | 110,263 | 113,462
United States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 390,930 | 522,404 | 498,025
Long-lived assets of continuing operating activities | 96,650 | 118,053 | 66,905
Canada [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 37,188 | 26,817 | 22,625
Long-lived assets of continuing operating activities | 5,445 | 6,186 | 7,440
United Kingdom [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 30,644 | 40,545 | 39,375
Other - Seg Reporting [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 24,752 | 34,757 | 47,167
Long-lived assets of continuing operating activities | 1,878 | 2,506 | 457
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Income (loss) from continuing operations, before income taxes | (134,165) | (41,349) | 48,549
Assets | 355,129 | 544,272 | 473,218
Depreciation and amortization | 22,176 | 25,675 | 11,593
Expenditures for Long-Lived Assets | 5,353 | 9,836 | 15,446
Net sales | 483,514 | 624,523 | 607,192
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Unallocated interest income | 87 | 206 | 530
Equity in loss of nonconsolidated investment | (1,290) | (413) | 1,282
Unallocated corporate amounts | (14,444) | (11,489) | (12,039)
Assets | 41,072 | 28,209 | 26,788
Depreciation and amortization | 1,316 | 999 | 984
Expenditures for Long-Lived Assets | 2,311 | 5,077 | 1,610
Segment Reconciling Items [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Inventory, LIFO Reserve, Effect on Income, Net | 2,643 | 2,468 | 738
Assets | $ (3,178) | (5,821) | (8,289)
Expenditures for Long-Lived Assets |  | $ 288 | $ 1,981

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