Finance Receivables (Wholesale And Retail Receivables Accruing Interest And Are Past Due) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Financing Receivable, Recorded Investment, Past Due [Line Items]
Receivables past due and accruing interest	$ 28,033	$ 28,378	$ 35,742	$ 26,790	$ 24,953
United States [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Receivables past due and accruing interest	26,500	27,171	34,391	24,629	23,678
Canada [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Receivables past due and accruing interest	$ 1,533	$ 1,207	$ 1,351	$ 2,161	$ 1,275