Finance Receivables (Investment Of Wholesale Finance Receivables By Internal And External Credit Quality Indicator) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross		$ 5,087,490
Finance receivables, gross		824,640	813,997	870,001	1,164,236
Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	816,404	824,640
Wholesale [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	8,107	13,048
Wholesale [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	2,593	5,052
Wholesale [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	3,504	14,361
Wholesale [Member] | Medium Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	8,451	3,032
Wholesale [Member] | Low Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	793,749	789,147
Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	5,073,115	5,087,490	5,377,161	4,091,893	740,721
Retail [Member] | Prime [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	4,035,584	4,097,048
Retail [Member] | Sub-Prime [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	$ 1,037,531	$ 990,442