Business Segments - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information
Total net sales	$ 128,775	$ 150,469
Segment Profit (Loss)	144	9,001
Rail Products and Services
Segment Reporting Information
Total net sales	70,204	75,694
Segment Profit (Loss)	1,171	3,479
Construction Products
Segment Reporting Information
Total net sales	29,034	37,345
Segment Profit (Loss)	(1,639)	834
Tubular and Energy Services
Segment Reporting Information
Total net sales	29,537	37,430
Segment Profit (Loss)	$ 612	$ 4,688

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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Balance Type:	credit
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