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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