Commitments and Contingent Liabilites (Narrative)(Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012 Reserve for Environmental Costs [Member]	Dec. 31, 2011 Reserve for Environmental Costs [Member]
Guarantor Obligations [Line Items]
Number of railroad ties sold	1,600,000
Number of replacement ties per defective tie	1.5
Estimated Litigation Liability		$ 2,132	$ 2,184