6. Interest Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest expense	$ 13,853	$ 19,560	$ 44,800	$ 61,696
Securitization Trust Debt
Interest expense	8,357	9,398	25,725	28,557
Warehouse Lines of Credit
Interest expense	1,447	2,179	4,026	5,243
Senior Secured Debt, Related Party
Interest expense	1,599	3,077	6,474	9,873
Debt secured by receivables at fair value
Interest expense	623	3,275	3,435	13,362
Residual interest financing
Interest expense	1,079	731	2,666	2,125
Subordinated renewable notes
Interest expense	$ 748	$ 900	$ 2,474	$ 2,536