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(9) Fair Value Measurements (Details - Finance Receivables to Their Contractual Balances) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Finance receivables measured at fair value | $ 1,540,955 | $ 1,537,649 | $ 1,444,038 | $ 1,313,205 | $ 1,158,365 | $ 821,066
Portion at Fair Value Measurement [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Finance receivables measured at fair value | 1,540,955 |  | 1,444,038 |  |  |
Contractual Balance |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Finance receivables measured at fair value | $ 1,658,662 |  | $ 1,492,803 |  |  |

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