6. Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest Expense Details
Securitization trust debt	$ 11,670	$ 9,381	$ 22,546	$ 18,697
Warehouse lines of credit	1,259	1,238	2,732	2,115
Senior secured debt, related party	0	0	0	1,651
Debt secured by receivables at fair value	0	205	0	533
Residual interest financing	351	504	773	1,083
Subordinated renewable notes	408	614	810	1,244
Total interest expense	$ 13,688	$ 11,942	$ 26,861	$ 25,323