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Goodwill and Other Intangible Assets (Schedule of Gross Other Intangible Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Gross intangible assets balance by reportable segment | $ 88,683 | $ 88,181
Rail Products and Services |  |
Gross intangible assets balance by reportable segment | 58,156 | 57,654
Construction Products |  |
Gross intangible assets balance by reportable segment | 1,348 | 1,348
Tubular and Energy Services |  |
Gross intangible assets balance by reportable segment | $ 29,179 | $ 29,179

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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