Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets, Gross	$ 160,617		$ 160,617		$ 95,771
Amortization of Intangible Assets	3,456	$ 1,172	$ 5,613	$ 2,313
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			15 years
Rail Products and Services [Member]
Finite-Lived Intangible Assets, Gross	59,273		$ 59,273		44,781
Construction Products Segment [Member]
Finite-Lived Intangible Assets, Gross	3,178		3,178		3,178
Tubular and Energy Services [Member]
Finite-Lived Intangible Assets, Gross	$ 98,166		$ 98,166		$ 47,812