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(2) Finance Receivables (Details - Amortized Cost Basis) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis | $ 576,227 | $ 895,566
Vintage Pool 2012 [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis | 851 | 2,432
Vintage Pool 2013 [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis | 6,212 | 15,489
Vintage Pool 2014 [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis | 29,878 | 61,290
Vintage Pool 2015 [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis | 95,522 | 162,242
Vintage Pool 2016 [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis | 190,788 | 292,360
Vintage Pool 2017 [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis | $ 252,976 | $ 361,753

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