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6. Interest Expense (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Interest Expense Details        
Securitization trust debt $ 9,582 $ 8,357 $ 28,279 $ 25,725
Warehouse lines of credit 1,531 1,447 3,646 4,026
Senior secured debt, related party 0 1,599 1,651 6,474
Debt secured by receivables at fair value 150 623 683 3,435
Residual interest financing 462 1,079 1,545 2,666
Subordinated renewable notes 514 748 1,758 2,474
Total interest expense $ 12,239 $ 13,853 $ 37,562 $ 44,800