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Debt - Schedule of Debt Issuance Costs, Net of accumulated Amortization (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | $ 23,952 | $ 22,642
SBA Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 4,972 | 5,262
July 2024 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 320 | 467
February 2025 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 191 | 249
June 2025 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 324 | 405
June 2025 3-Year Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 306 | 384
March 2026 A Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 253 | 300
March 2026 B Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 275 | 327
September 2026 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 3,151 | 3,642
January 2027 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 4,731 | 5,396
2031 Asset-Backed Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 1,749 | 2,043
2033 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs |  | 1,120 | 1,174
MUFG Bank Facility |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs | [1] | 4,425 | 1,292
SMBC Facility |  |  |
Debt Instrument [Line Items] |  |  |
Net of debt issuance costs | [1] | $ 2,135 | $ 1,701
[1] | The MUFG Bank Facility (f.k.a. Union Bank Facility) and SMBC Facility, are line-of-credit arrangements, the debt issuance costs associated with these instruments are included within Other assets on the Consolidated Statements of Assets and Liabilities in accordance with ASC Subtopic 835-30.

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