Finance Receivables Credit Quality (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 Rate	Dec. 31, 2011 Rate
Financing Receivable, Recorded Investment [Line Items]
Percent FICO Scores Less Than 540	27.40%	22.00%
Percent FICO Scores 540 to 599	45.60%	43.10%
Percent FICO Scores 600 to 659	22.90%	27.10%
Percent FICO Scores Greater Than 660	4.10%	7.80%
Total Percent FICO	100.00%	100.00%
Financing Receivable, Net	$ 10,998,274	$ 9,162,492
Consumer Credit Score [Member]
Financing Receivable, Recorded Investment [Line Items]
FICO Scores 540 to 599	3,010,927	2,133,361
FICO Scores 540 to 599	5,013,812	4,166,988
FICO Scores Greater Than 660	454,885	755,743
FICO Scores 600 to 659	2,513,153	2,623,882
Financing Receivable, Net	$ 10,992,777	$ 9,679,974