Finance Receivables Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings - Number of Loans Entering a Modification Program	6,992	649
Principal Collection and Recoveries on Receivables	$ 1,096,275	$ 1,015,918
Troubled Debt Restructurings - Subsequent Default	5,265	107
Impaired Financing Receivable, Average Recorded Investment	281,916	48,314
Financing Receivable, Modifications, Recorded Investment	335,512		228,320
Allowance Related to Finance Receivable Modifications	(43,957)		(32,575)
Financing Receivable, Modifications, Post-Modification Recorded Investment	291,555		195,745
Impaired Financing Receivable, Unpaid Principal Balance	341,469		231,844
Loans and Leases Receivable, Impaired, Troubled Debt, Interest Income Earne	10,381	135
Troubled Debt Restructurings - Amount of Loans That Entered a Loan Modification Program	131,245	12,957
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Gross	882,736		559,999
Finance Receivables Purchased	1,040,376
Principal Collection and Recoveries on Receivables	(717,639)
Financing Receivable, Modifications, Recorded Investment	4,176
Allowance Related to Finance Receivable Modifications	(1,830)
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,346
Impaired Financing Receivable, Unpaid Principal Balance	4,662
Loans and Leases Receivable, Impaired, Troubled Debt, Interest Income Earne	$ 42