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Business Segments (Revenue by Product Line) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets |  |  |
Net Sales | $ 536,377 | $ 483,514 | $ 624,523
Rail Technologies |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Net Sales | 100,257 | 90,469 | 98,237
Rail Distribution |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Net Sales | 90,696 | 83,236 | 126,277
Piling |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Net Sales | 73,158 | 70,535 | 94,853
Precast Concrete Products |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Net Sales | 55,877 | 54,514 | 52,044
Test and Inspection Services |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Net Sales | 39,198 | 20,765 | 35,906
Protective Coatings |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Net Sales | 38,096 | 23,043 | 33,532
Fabricated Bridge |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Net Sales | 32,766 | 20,553 | 29,496
Precision Measurement Systems |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Net Sales | 29,670 | 42,830 | 36,048
Other products |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Net Sales | $ 76,659 | $ 77,569 | $ 118,130

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