Finance Receivables (Contractual Maturities Of Finance Receivables) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
2012	$ 1,790,733
2013	1,051,473
2014	1,187,956
2015	1,342,192
2015	426,585
Thereafter	113,191
Total	5,912,130
United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2012	1,701,602
2013	1,005,315
2014	1,136,485
2015	1,284,797
2015	395,711
Thereafter	113,191
Total	5,637,101
Canada [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2012	89,131
2013	46,158
2014	51,471
2015	57,395
2015	30,874
Total	$ 275,029