Acquisitions (Interlocking Deck Systems International, LLC) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended
	Dec. 15, 2010 Portec Rail Products, Inc. [Member]	Dec. 31, 2012 Portec Rail Products, Inc. [Member]	Jan. 31, 2011 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, Cost of Acquired Entity, Purchase Price				$ 7,000
Business Acquisition, Cost of Acquired Entity, Cash Paid	113,322			5,050
Business Acquisition, Cost of Acquired Entity, Cash Paid, Payment On First Anniversary Of Closing				1,000
Business Acquisition, Cost of Acquired Entity, Cash Paid, Final Payment			8,952	950
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred				$ 0
Business Acquisition, Pro Forma Information, Description	The unaudited pro forma results for the periods presented below are prepared as if the transaction occurred as of January 1, 2010. Pro forma adjustments exclude operating results of the divested rail joint business, and include depreciation and amortization and other adjustments in connection with the acquisition			The pro forma results for this acquisition were not material to the Company's financial results