Commitments and Contingent Liabilites (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2012
Product Liability Contingency [Line Items]
Standard Product Warranty Accrual	$ 10,154	$ 10,154	$ 8,755
Accrual for Environmental Loss Contingencies	6,270	6,270	6,640
Reserve for Concrete Ties [Member]
Product Liability Contingency [Line Items]
Litigation Settlement, Amount					$ 12,000
Product Warranty Expense		204	972	$ 9,854	$ 22,000
Standard Product Warranty Accrual	7,574	$ 7,574	$ 7,544
Collective Action Complaint [Member]
Product Liability Contingency [Line Items]
Litigation Settlement, Amount	900
Transit Products [Member]
Product Liability Contingency [Line Items]
Product Warranty Expense	$ 1,224