Commitments and Contingent Liabilites (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Product Liability Contingency [Line Items]
Standard Product Warranty Accrual	$ 7,010	$ 7,483
Reserve for Concrete Ties [Member]
Product Liability Contingency [Line Items]
Standard Product Warranty Accrual	6,050	6,462
Reserve for Environmental Costs [Member]
Product Liability Contingency [Line Items]
Estimated Litigation Liability	$ 2,173	$ 2,190