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11. Fair Value Measurements (Details-Level 3 fair value measurements) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Finance receivables
Dec. 31, 2013
Finance receivables
Sep. 30, 2014
Residual interest in securitizations
Dec. 31, 2013
Residual interest in securitizations
Sep. 30, 2014
DebtSecuredReceivablesMember
Dec. 31, 2013
Debt secured by receivables measured at fair value
Finance receivables measured at fair value $ 3,202 $ 5,686 $ 9,058 $ 14,476 $ 21,217 $ 30,319 $ 43,021 $ 59,668 $ 3,202 $ 14,476        
Residual interest in securitizations 135     854             135 854    
Debt secured by receivables measured at fair value $ 3,170     $ 13,117                 $ 3,170 $ 13,117
Valuation Techniques and Unobservable Inputs                 Discounted cash flows; Discount rate 15.4%, Cumulative net losses 5.0%, Monthly average prepayments 0.5% Discounted cash flows; Discount rate 15.4%, Cumulative net losses 5.0%, Monthly average prepayments 0.5% Discounted cash flows; Discount rate 20.0%, Cumulative net losses 15.0%, Monthly average prepayments 0.5% Discounted cash flows; Discount rate 20.0%, Cumulative net losses 15.0%, Monthly average prepayments 0.5% Discounted cash flows, Discount rate 12.2% Discounted cash flows, Discount rate 12.2%