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10. Fair Value Measurements (Details-Level 3 fair value measurements) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Finance receivables measured at fair value $ 135 $ 316 $ 1,664 $ 3,202 $ 5,686 $ 14,476
Debt secured by receivables measured at fair value $ 0   $ 1,250      
Finance receivables            
Valuation Techniques Discounted cash flows          
Unobservable Inputs            
Discount rate 15.40%   15.40%      
Cumulative net losses 5.00%   5.00%      
Monthly average prepayments 0.50%   0.50%      
Debt secured by receivables measured at fair value            
Valuation Techniques Discounted cash flows          
Unobservable Inputs            
Discount rate 0.00%   12.20%