Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill, Impairment Loss	$ 128,938	$ 61,142	$ 80,337	$ 0
Impairment of Long-Lived Assets Held-for-use			0	0
Impairment of Intangible Assets, Finite-lived		59,786	0	0
Finite-Lived Intangible Assets, Gross		87,003	158,740
Amortization of Intangible Assets		$ 9,575	12,245	$ 4,695
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]
Goodwill, Impairment Loss		$ 32,725	0
Finite-Lived Intangible Assets, Gross		56,476	59,226
Construction Products [Member]
Goodwill, Impairment Loss		0	0
Finite-Lived Intangible Assets, Gross		1,348	1,348
Tubular and Energy Services [Member]
Goodwill, Impairment Loss		28,417	80,337
Finite-Lived Intangible Assets, Gross		29,179	$ 98,166
Inspection Oilfield Services (IOS) [Member]
Goodwill, Impairment Loss		69,908
Chemtec Energy Services, LLC [Member]
Goodwill, Impairment Loss		$ 10,429