Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill, Beginning Balance		$ 81,752	$ 82,949
Goodwill, Gross					$ 160,411	$ 162,089
Acquisitions			79,502
Foreign currency translation impact		(1,524)	(362)
Disposition		(154)
Impairment charges	$ (128,938)	(61,142)	(80,337)	$ 0
Accumulated impairment losses					(141,479)	(80,337)
Goodwill, Total		81,752	82,949	82,949	18,932	81,752
Rail Products and Services [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		48,188	38,956
Goodwill, Gross					46,510	48,188
Acquisitions			9,594
Foreign currency translation impact		(1,524)	(362)
Disposition		(154)
Impairment charges		(32,725)	0
Accumulated impairment losses					(32,725)	0
Goodwill, Total		48,188	38,956	38,956	13,785	48,188
Construction Products [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		5,147	5,147
Goodwill, Gross					5,147	5,147
Acquisitions			0
Foreign currency translation impact		0	0
Disposition		0
Impairment charges		0	0
Accumulated impairment losses					0	0
Goodwill, Total		5,147	5,147	5,147	5,147	5,147
Tubular and Energy Services [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		28,417	38,846
Goodwill, Gross					108,754	108,754
Acquisitions			69,908
Foreign currency translation impact		0	0
Disposition		0
Impairment charges		(28,417)	(80,337)
Accumulated impairment losses					(108,754)	(80,337)
Goodwill, Total		$ 28,417	$ 38,846	$ 38,846	$ 0	$ 28,417