Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets, Gross	$ 158,392		$ 158,740
Amortization of Intangible Assets	$ 3,266	$ 2,157
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	25 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	2 years
Weighted Average [Member]
Finite-Lived Intangible Asset, Useful Life	14 years
Rail Products and Services [Member]
Finite-Lived Intangible Assets, Gross	$ 58,878		59,226
Construction Products [Member]
Finite-Lived Intangible Assets, Gross	1,348		1,348
Tubular and Energy Services [Member]
Finite-Lived Intangible Assets, Gross	$ 98,166		$ 98,166