Finance Receivables Delinquency (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 31 to 60 Days Past Due	$ 672,580	$ 517,083
Financing Receivable, Recorded Investment, Greater than 60 Days Past Due	229,879	181,691
Financing Receivable, Recorded Investment, Greater than 30 Days Past Due	902,459	698,774
Financing Receivable in Repossesion	30,906	26,824
Financing Receivable, Recorded Investment, Past Due	$ 933,365	$ 725,598
Percent of Contractual Amount Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Percent of Contractual Amount Due 31 Days to 60 days	0.00%	0.00%
Percent of Contractual Amount Due Greater Than 60 Days	0.00%	0.00%
Percent of Contractual Amount Due Greater than 31 days	0.00%	0.00%
Percent of Contractual Amount Due in Repossession	0.00%	0.00%
Percent of Contracutal Amount Due Greater Than 31 Days and in Repossession	0.00%	0.00%