Business Segments (Reconciliation of Significant Reconciling Items) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 483,514		$ 624,523	$ 607,192
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
Rail Products and Services [Member]
Segment Reporting Information [Line Items]
Net sales	239,127		328,982	374,615
Segment Profit (Loss)	(26,228)	[1]	27,037	30,093
Assets	174,049		241,222	239,951
Depreciation and amortization	7,276		8,098	6,153
Expenditures for Long-Lived Assets	856		4,273	5,115
Construction Products [Member]
Segment Reporting Information [Line Items]
Net sales	145,602		176,394	178,847
Segment Profit (Loss)	8,189	[1]	12,958	13,106
Assets	81,074		86,335	102,978
Depreciation and amortization	2,256		2,720	2,232
Expenditures for Long-Lived Assets	687		1,260	3,343
Tubular and Energy Services [Member]
Segment Reporting Information [Line Items]
Net sales	98,785		119,147	53,730
Segment Profit (Loss)	(116,126)	[1],[2]	(81,344)	5,350
Assets	100,006		216,715	130,289
Depreciation and amortization	12,644		14,857	3,208
Expenditures for Long-Lived Assets	3,810		4,303	6,988
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	483,514		624,523	607,192
Segment Profit (Loss)	(134,165)	[1]	(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

[1] Segment loss includes impairment of goodwill, definite-lived intangible assets and property, plant and equipment as further described in Note 4 Goodwill and Other Intangible Assets and Note 7 Property, Plant and Equipment.

[2] Segment loss includes impairment of goodwill as further described in Note 4 Goodwill and Other Intangible Assets.