Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 82,949
Acquisitions	79,448
Foreign currency translation impact	243
Goodwill, Ending Balance	162,640
Rail Products and Services [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	38,956
Acquisitions	8,772
Foreign currency translation impact	243
Goodwill, Ending Balance	47,971
Construction Products Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	5,147
Acquisitions	0
Foreign currency translation impact	0
Goodwill, Ending Balance	5,147
Tubular and Energy Services [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	38,846
Acquisitions	70,676
Foreign currency translation impact	0
Goodwill, Ending Balance	$ 109,522