Acquisitions (Portec Rail Products, Inc.) (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended				0 Months Ended	12 Months Ended
	Dec. 31, 2012 Portec Rail Products, Inc. [Member]	Dec. 31, 2010 Portec Rail Products, Inc. [Member]	Jan. 31, 2011 Portec Rail Products, Inc. [Member]	Dec. 15, 2010 Portec Rail Products, Inc. [Member]	Mar. 23, 2010 Interlocking Deck Systems International, LLC [Member]	Dec. 31, 2012 Interlocking Deck Systems International, LLC [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Dec. 15, 2010					Mar. 23, 2010
Business Acquisition, Name of Acquired Entity	Portec Rail Products, Inc. (Rail Technologies)				Interlocking Deck Systems International, LLC (IDSI)
Business Acquisition, Share Price				$ 11.80
Business Acquisition, Cost of Acquired Entity, Cash Paid				$ 113,322	$ 5,050
Business Acquisition, Cost of Acquired Entity, Cash Paid, Final Payment			8,952		950
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		4,556
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		(212)
Business Acquisition, Preexisting Relationship, Gain (Loss) Recognized				1,364
Business Acquisition, Cost of Acquired Entity, Transaction Costs		$ 2,413