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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Mar. 31, 2021 | Dec. 31, 2020
Variable Interest Entity [Line Items] |  |  |
Restricted cash |  | $ 79,049 | $ 60,514
Notes receivable and residual certificates (at fair value) |  |  |
Variable Interest Entity [Line Items] |  |  |
Loans, notes receivables, and residual certificates |  | 16,033 | 19,074
Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Restricted cash |  | 19,440 | 12,371
Variable Interest Entity, Primary Beneficiary | Notes receivable and residual certificates (at fair value) |  |  |
Variable Interest Entity [Line Items] |  |  |
Loans, notes receivables, and residual certificates |  | 14,678 | 17,219
Variable Interest Entity, Primary Beneficiary | Majority-owned Affiliates |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership percentage | 20.00% |  |
Variable Interest Entity, Primary Beneficiary | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership interest sold | 80.00% |  |
Consideration received | $ 8,000 |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Restricted cash |  | 7,200 | 7,200
Variable Interest Entity, Not Primary Beneficiary | Notes receivable and residual certificates (at fair value) |  |  |
Variable Interest Entity [Line Items] |  |  |
Loans, notes receivables, and residual certificates |  | $ 16,000 | $ 18,900

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