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(9) Fair Value Measurements (Details - Level 3 Fair Value Measurements) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Finance receivables measured at fair value | $ 1,533,723 | $ 1,523,726 | $ 1,559,697 | $ 1,444,038
Portion at Fair Value Measurement [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Finance receivables measured at fair value | 1,533,723 | 1,523,726 |  |
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 | $ 1,533,723 | $ 1,523,726 |  |
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 | 11.00% | 10.40% |  |
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 | 11.30% | 11.10% |  |
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input Cumulative Net Lossese [Member] | Minimum [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Unobservable Inputs | 15.40% | 15.30% |  |
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input Cumulative Net Lossese [Member] | Maximum [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Unobservable Inputs | 18.40% | 18.40% |  |

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- Definition Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13728-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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