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(12) Fair Value Measurements (Details - Finance Receivables to Their Contractual Balances) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Finance receivables measured at fair value | $ 1,523,726 | $ 1,444,038 | $ 821,066
Portion at Fair Value Measurement [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Finance receivables measured at fair value | 1,523,726 | 1,444,038 |
Contractual Balance |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Finance receivables measured at fair value | $ 1,668,076 | $ 1,492,803 |

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