Finance Receivables Age Analysis of Past Due Finance Receivables (Details) (USD $) In Thousands, unless otherwise specified				3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2013 Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan charge-offs, days delinquent at month end				91 days	121 days
Current, Percent of Portfolio	61.40%	49.10%	65.80%
Current, Loan Principal	$ 1,047,962	$ 786,765	$ 1,030,752
01-30 Days, Percent of Portfolio	28.00%	33.00%	27.40%
01-30 Days, Loan Principal	478,861	528,300	429,219
31-60 Days, Percent of Portfolio	6.90%	10.00%	4.30%
31-60 Days, Loan Principal	117,721	161,157	67,359
61-90 Days, Percent of Portfolio	3.20%	5.10%	2.20%
61-90 Days, Loan Principal	54,537	81,378	34,463
91-120 Days, Percent of Portfolio	0.50%	2.80%	0.30%
91-120 Days, Loan Principal	7,970	44,110	4,699
Total Past Due, Percent of Portfolio	38.60%	50.90%	34.20%
Total Past Due, Loan Principal	659,089	814,945	535,740
Total Finance Receivales, Percent of Portfolio	100.00%	100.00%	100.00%
Total Finance Receivables, Loan Principal	$ 1,707,051	$ 1,601,710	$ 1,566,492