5. Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest Expense Details
Securitization trust debt	$ 12,466	$ 9,582	$ 35,012	$ 28,279
Warehouse lines of credit	1,644	1,531	4,376	3,646
Senior secured debt, related party	0	0	0	1,651
Debt secured by receivables at fair value	0	150	0	683
Residual interest financing	338	462	1,111	1,545
Subordinated renewable notes	400	514	1,210	1,758
Total interest expense	$ 14,848	$ 12,239	$ 41,709	$ 37,562