Fair Value Of Financial Instruments (Summary Of The Fair Value And Carrying Value Of The Company's Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 1,068,138	$ 1,526,950	$ 1,021,933	$ 1,630,433
Marketable securities	135,634	153,380
Accounts receivable, net	230,079	219,039
Restricted cash	188,008	229,655
Accounts payable	257,386	255,713
Term asset-backed securitization debt		2,087,346
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,068,138	1,526,950
Marketable securities	135,634	153,380
Accounts receivable, net	230,079	219,039
Derivatives, Assets	317	16,443
Finance receivables, net	5,861,442	5,888,040
Restricted cash	188,008	229,655
Accounts payable	257,386	255,713
Derivatives, Liabilities	7,920	5,136
Unsecured commercial paper	294,943	874,286
Credit facilities	0	159,794
AssetBackedCanadianCommericalPaper	175,658	0
Medium-term notes	3,199,548	2,561,458
Senior unsecured notes	338,594	376,513
Term asset-backed securitization debt	1,457,807	2,099,060
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,068,138	1,526,950
Marketable securities	135,634	153,380
Accounts receivable, net	230,079	219,039
Derivatives, Assets	317	16,443
Finance receivables, net	5,781,852	5,786,681
Restricted cash	188,008	229,655
Accounts payable	257,386	255,713
Derivatives, Liabilities	7,920	5,136
Unsecured commercial paper	294,943	874,286
Credit facilities	0	159,794
AssetBackedCanadianCommericalPaper	175,658	0
Medium-term notes	2,881,272	2,298,193
Senior unsecured notes	303,000	303,000
Term asset-backed securitization debt	$ 1,447,776	$ 2,087,346