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10. Fair Value Measurements (Details - Finance Receivables to Their Contractual Balances) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Finance receivables measured at fair value $ 614,807 $ 412,895 $ 0 $ 0 $ 0 $ 0
Fair Value [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Finance receivables measured at fair value 614,807   0      
Contractual Balance [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Finance receivables measured at fair value $ 614,578   $ 0