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13. Fair Value Measurements (Details - Finance Receivables to Their Contractual Balances) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Finance receivables measured at fair value | $ 821,066 | $ 0 | $ 0
Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Finance receivables measured at fair value | 821,066 | 0 |
Contractual Balance [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Finance receivables measured at fair value | $ 829,039 | $ 0 |

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