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Contingent Liabilities And Commitments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified			1 Months Ended
	Jan. 31, 2012	Jul. 31, 2011	Dec. 31, 2011 Multidistrict Litigation Court [Member] lawsuits	Jan. 31, 2012 Multidistrict Litigation Court [Member]
Loss Contingencies [Line Items]
Repurchase and guarantee reserve balances	$ 3,550	$ 3,479
Chassis delivered to customers in days	90 days
Chassis consigned inventory	12,900
Additional chassis provided by customers	9,580
Suits currently pending	500			4,100
Number of new claims filed			400
Amount accrued for resolution of litigation	$ 5,000