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Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Of Outstanding Borrowings (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | $ 1,751,998 | $ 1,554,869
Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 1,751,998 | 1,554,869
Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 1,652,970 | 1,450,995
SBA Debentures | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 170,469 | 170,323
SBA Debentures | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 147,970 | 142,011
July 2024 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 104,902 | 104,828
July 2024 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 105,145 | 105,755
February 2025 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 49,895 | 49,866
February 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 48,922 | 49,144
June 2025 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 69,798 | 69,757
June 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 68,342 | 67,198
June 2025 3-Year Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 49,810 | 49,771
June 2025 3-Year Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 49,813 | 48,983
March 2026 A Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 49,818 | 49,795
March 2026 A Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 47,335 | 47,702
March 2026 B Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 49,802 | 49,776
March 2026 B Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 47,381 | 47,759
September 2026 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 322,585 | 322,339
September 2026 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 288,832 | 288,711
January 2027 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 346,266 | 345,935
January 2027 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 314,530 | 315,832
2031 Asset-Backed Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 148,691 | 148,544
2031 Asset-Backed Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 143,700 | 142,500
2033 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 38,962 | 38,935
2033 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 40,000 | 40,400
MUFG Bank Facility | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 136,000 | 61,000
MUFG Bank Facility | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 136,000 | 61,000
SMBC Facility | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 215,000 | 94,000
SMBC Facility | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 215,000 | 94,000
Observable Inputs (Level 2) | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 183,700 | 182,900
Observable Inputs (Level 2) | 2031 Asset-Backed Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 143,700 | 142,500
Observable Inputs (Level 2) | 2033 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 40,000 | 40,400
Unobservable Inputs (Level 3) | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 1,469,270 | 1,268,095
Unobservable Inputs (Level 3) | SBA Debentures | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 147,970 | 142,011
Unobservable Inputs (Level 3) | July 2024 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 105,145 | 105,755
Unobservable Inputs (Level 3) | February 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 48,922 | 49,144
Unobservable Inputs (Level 3) | June 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 68,342 | 67,198
Unobservable Inputs (Level 3) | June 2025 3-Year Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 49,813 | 48,983
Unobservable Inputs (Level 3) | March 2026 A Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 47,335 | 47,702
Unobservable Inputs (Level 3) | March 2026 B Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 47,381 | 47,759
Unobservable Inputs (Level 3) | September 2026 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 288,832 | 288,711
Unobservable Inputs (Level 3) | January 2027 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 314,530 | 315,832
Unobservable Inputs (Level 3) | MUFG Bank Facility | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 136,000 | 61,000
Unobservable Inputs (Level 3) | SMBC Facility | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | $ 215,000 | $ 94,000

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