Commitments and Contingent Liabilites (Narrative) (Details) $ in Thousands, item in Millions	9 Months Ended	168 Months Ended
	Sep. 30, 2015 USD ($)	Dec. 31, 2011 item	Dec. 31, 2014 USD ($)
Product Liability Contingency [Line Items]
Concrete Ties Manufactured | item		3.0
Standard Product Warranty Accrual	$ 9,430		$ 11,500
Accrual for Environmental Loss Contingencies	6,690		3,344
Tucson, AZ [Member]
Product Liability Contingency [Line Items]
Impairment of fixed assets	409
Reserve for Concrete Ties [Member]
Product Liability Contingency [Line Items]
Standard Product Warranty Accrual	$ 8,289		$ 10,331
The UPRR [Member]
Product Liability Contingency [Line Items]
Concrete Ties Manufactured | item		1.6