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(9) Fair Value Measurements (Details - Level 3 Fair Value Measurements) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Finance receivables measured at fair value | $ 1,537,649 | $ 1,559,697 | $ 1,444,038 | $ 1,158,365 | $ 997,552 | $ 821,066
Portion at Fair Value Measurement [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Finance receivables measured at fair value | 1,537,649 |  | 1,444,038 |  |  |
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Finance receivables measured at fair value | $ 1,537,649 |  | $ 1,444,038 |  |  |
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Unobservable Inputs | 10.00% |  | 8.90% |  |  |
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Unobservable Inputs | 11.10% |  | 11.10% |  |  |
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | CPS 2014-C [Member] | Minimum [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Unobservable Inputs | 15.30% |  | 15.00% |  |  |
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | CPS 2014-C [Member] | Maximum [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Unobservable Inputs | 18.40% |  | 16.10% |  |  |

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