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5. Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Total interest expense $ 19,727 $ 13,688 $ 37,548 $ 26,861
Securitization Trust Debt [Member]        
Total interest expense 16,875 11,670 31,639 22,546
Warehouse lines of credit [Member]        
Total interest expense 2,244 1,259 4,666 2,732
Residual interest financing [Member]        
Total interest expense 245 351 516 773
Subordinated renewable notes [Member]        
Total interest expense $ 363 $ 408 $ 727 $ 810