Goodwill and Other Intangible Assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 04, 2012
Disposal Group, Including Discontinued Operation, Goodwill						$ 2,588
Disposal Group, Including Discontinued Operation, Intangible Assets, Net						170
Goodwill	41,237		41,237		41,237
Intangible Assets, Net (Excluding Goodwill)	38,808		38,808		40,165
Amortization of Intangible Assets	700	697	1,401	1,394
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life			25 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life			5 years
Rail Products Segment [Member]
Goodwill	38,026		38,026		38,026
Intangible Assets, Net (Excluding Goodwill)	44,550		44,550		44,506
Construction Products Segment [Member]
Goodwill	3,211		3,211		3,211
Intangible Assets, Net (Excluding Goodwill)	$ 2,305		$ 2,305		$ 2,305