5. Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Total interest expense	$ 17,821	$ 13,173
Securitization Trust Debt [Member]
Total interest expense	14,764	10,876
Warehouse lines of credit [Member]
Total interest expense	2,422	1,473
Residual interest financing [Member]
Total interest expense	271	423
Subordinated renewable notes [Member]
Total interest expense	$ 364	$ 401