Goodwill and Other Intangible Assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Goodwill	$ 59,603		$ 59,603		$ 57,781
Finite-Lived Intangible Assets, Gross	62,315		62,315		60,967
Intangible Assets, Net (Excluding Goodwill)	49,789		49,789		51,846
Amortization of Intangible Assets	1,191	701	3,504	2,102
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life			25 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life			5 years
Weighted Average [Member]
Finite-Lived Intangible Asset, Useful Life			17 years
Rail Products Segment [Member]
Goodwill	38,026		38,026		38,026
Finite-Lived Intangible Assets, Gross	44,455		44,455		44,455
Construction Products Segment [Member]
Goodwill	5,033		5,033		3,211
Finite-Lived Intangible Assets, Gross	3,178		3,178		1,830
Tubular Products Segments [Member]
Goodwill	16,544		16,544		16,544
Finite-Lived Intangible Assets, Gross	$ 14,682		$ 14,682		$ 14,682