Finance Receivables (Aging Of Past Due Finance Receivables Including Non-Accrual Status Finance Receivables) (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		$ 5,087,490
Finance receivables, gross		824,640	813,997	870,001	1,164,236
Total	5,889,519	5,912,130
Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	5,073,115	5,087,490	5,377,161	4,091,893	740,721
Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	816,404	824,640
Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables		4,915,711
Finance receivables, gross		822,610
Total	5,709,381	5,738,321
Current [Member] | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	4,894,675
Current [Member] | Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	814,706
31-60 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	114,588
31-60 Days Past Due [Member] | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	113,604
31-60 Days Past Due [Member] | Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	984
61-90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables		36,937
Finance receivables, gross		344
Total	37,517	37,281
61-90 Days Past Due [Member] | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	37,239
61-90 Days Past Due [Member] | Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	278
Greater Than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	28,033
Greater Than 90 Days Past Due [Member] | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	27,597
Greater Than 90 Days Past Due [Member] | Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	436
Total Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables		171,779
Finance receivables, gross		2,030
Total	180,138	173,809
Total Past Due [Member] | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	178,440
Total Past Due [Member] | Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, gross	$ 1,698