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Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Of Outstanding Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | $ 1,554,869 | $ 1,574,351
Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | 1,554,869 | 1,574,351
Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 1,450,995 | 1,434,445
SBA Debentures | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | 170,323 | 169,738
SBA Debentures | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 142,011 | 155,257
July 2024 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | 104,828 | 104,533
July 2024 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 105,755 | 102,019
February 2025 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | 49,866 | 49,751
February 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 49,144 | 47,044
June 2025 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | 69,757 | 69,595
June 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 67,198 | 64,198
June 2025 3-Year Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | 49,771 | 49,616
June 2025 3-Year Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 48,983 | 47,528
March 2026 A Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | 49,795 | 49,700
March 2026 A Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 47,702 | 45,512
March 2026 B Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | 49,776 | 49,673
March 2026 B Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 47,759 | 45,588
September 2026 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | 322,339 | 321,358
September 2026 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 288,711 | 269,509
January 2027 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | 345,935 | 344,604
January 2027 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 315,832 | 296,826
2031 Asset-Backed Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | 148,544 | 147,957
2031 Asset-Backed Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 142,500 | 142,620
2033 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | 38,935 | 38,826
2033 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 40,400 | 39,344
MUFG Bank Facility | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | 61,000 | 107,000
MUFG Bank Facility | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 61,000 | 107,000
SMBC Facility | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Net of debt issuance costs | 94,000 | 72,000
SMBC Facility | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 94,000 | 72,000
Identical Assets Level 1 | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Identical Assets Level 1 | SBA Debentures | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Identical Assets Level 1 | July 2024 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Identical Assets Level 1 | February 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Identical Assets Level 1 | June 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Identical Assets Level 1 | June 2025 3-Year Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 |
Identical Assets Level 1 | June 2025 3-Year Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value |  | 0
Identical Assets Level 1 | March 2026 A Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Identical Assets Level 1 | March 2026 B Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Identical Assets Level 1 | September 2026 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Identical Assets Level 1 | January 2027 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Identical Assets Level 1 | 2031 Asset-Backed Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Identical Assets Level 1 | 2033 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Identical Assets Level 1 | MUFG Bank Facility | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Identical Assets Level 1 | SMBC Facility | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Observable Inputs Level 2 | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 182,900 | 181,964
Observable Inputs Level 2 | SBA Debentures | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Observable Inputs Level 2 | July 2024 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Observable Inputs Level 2 | February 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Observable Inputs Level 2 | June 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Observable Inputs Level 2 | June 2025 3-Year Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Observable Inputs Level 2 | March 2026 A Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Observable Inputs Level 2 | March 2026 B Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Observable Inputs Level 2 | September 2026 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Observable Inputs Level 2 | January 2027 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Observable Inputs Level 2 | 2031 Asset-Backed Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 142,500 | 142,620
Observable Inputs Level 2 | 2033 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 40,400 | 39,344
Observable Inputs Level 2 | MUFG Bank Facility | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Observable Inputs Level 2 | SMBC Facility | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Unobservable Inputs Level 3 | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 1,268,095 | 1,252,481
Unobservable Inputs Level 3 | SBA Debentures | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 142,011 | 155,257
Unobservable Inputs Level 3 | July 2024 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 105,755 | 102,019
Unobservable Inputs Level 3 | February 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 49,144 | 47,044
Unobservable Inputs Level 3 | June 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 67,198 | 64,198
Unobservable Inputs Level 3 | June 2025 3-Year Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 48,983 | 47,528
Unobservable Inputs Level 3 | March 2026 A Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 47,702 | 45,512
Unobservable Inputs Level 3 | March 2026 B Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 47,759 | 45,588
Unobservable Inputs Level 3 | September 2026 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 288,711 | 269,509
Unobservable Inputs Level 3 | January 2027 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 315,832 |
Unobservable Inputs Level 3 | January 2027 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value |  | 296,826
Unobservable Inputs Level 3 | 2031 Asset-Backed Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Unobservable Inputs Level 3 | 2033 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 0 | 0
Unobservable Inputs Level 3 | MUFG Bank Facility | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 61,000 | 107,000
Unobservable Inputs Level 3 | SMBC Facility | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | $ 94,000 | $ 72,000

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