Finance Receivables Age Analysis of Past Due Finance Receivables (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Loan Principal [Abstract]
Current	$ 786,765	$ 979,155
01-30 Days	528,300	322,670
31-60 Days	161,157	104,574
61-90 Days	81,378	55,881
91-120 Days	44,110	4,400
Total Past Due	814,945	487,525
Principal Balances	$ 1,601,710	$ 1,466,680
Percent of Portfolio [Abstract]
Current, Percent of Portfolio	49.10%	66.80%
01 To 30 Days, Percent of Portfolio	33.00%	22.00%
31 To 60 Days, Percent of Portfolio	10.00%	7.10%
61 To 90 Days, Percent of Portfolio	5.10%	3.80%
91 to 120 Days Past Due, Percent of Portfolio	2.80%	0.30%
Total Past Due, Percent of Portfolio	50.90%	33.20%
Total Finance Receivables, Percent of Portfolio	100.00%	100.00%