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13. Fair Value Measurements (Details - Level 3 Fair Value Measurements) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finance receivables measured at fair value $ 821,066 $ 0 $ 0
Fair Value [Member]      
Finance receivables measured at fair value 821,066 0  
Fair Value [Member] | Level 3 [Member]      
Finance receivables measured at fair value $ 821,066 $ 0  
Fair Value [Member] | Level 3 [Member] | Discount Rate [Member] | Minimum [Member]      
Unobservable Inputs, Inputs as of 8.90%    
Fair Value [Member] | Level 3 [Member] | Discount Rate [Member] | MaximumMember      
Unobservable Inputs, Inputs as of 9.90%    
Fair Value [Member] | Level 3 [Member] | Cumulative Net Losses [Member] | Minimum [Member]      
Unobservable Inputs, Inputs as of 15.00%    
Fair Value [Member] | Level 3 [Member] | Cumulative Net Losses [Member] | MaximumMember      
Unobservable Inputs, Inputs as of 16.00%