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(2) Finance Receivables (Details - Amortized Cost Basis) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis | $ 668,449 | $ 895,566
Vintage Pool 2012 [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis | 1,312 | 2,432
Vintage Pool 2013 [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis | 9,057 | 15,489
Vintage Pool 2014 [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis | 41,225 | 61,290
Vintage Pool 2015 [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis | 122,363 | 162,242
Vintage Pool 2016 [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis | 228,234 | 292,360
Vintage Pool 2017 [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Amortized cost basis | $ 266,258 | $ 361,753

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