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Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Of Outstanding Borrowings (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | $ 1,747,127 | $ 1,554,869
Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 1,747,127 | 1,554,869
Carrying Value | SBA Debentures |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 170,615 | 170,323
Carrying Value | July 2024 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 104,975 | 104,828
Carrying Value | February 2025 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 49,924 | 49,866
Carrying Value | June 2025 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 69,838 | 69,757
Carrying Value | June 2025 3-Year Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 49,848 | 49,771
Carrying Value | March 2026 A Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 49,842 | 49,795
Carrying Value | March 2026 B Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 49,828 | 49,776
Carrying Value | September 2026 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 322,830 | 322,339
Carrying Value | January 2027 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 346,600 | 345,935
Carrying Value | 2031 Asset-Backed Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 148,838 | 148,544
Carrying Value | 2033 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 38,989 | 38,935
Carrying Value | MUFG Bank Facility |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 133,000 | 61,000
Carrying Value | SMBC Facility |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 212,000 | 94,000
Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 1,660,735 | 1,450,995
Fair Value | Observable Inputs (Level 2) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 182,340 | 182,900
Fair Value | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 1,478,395 | 1,268,095
Fair Value | SBA Debentures |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 149,839 | 142,011
Fair Value | SBA Debentures | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 149,839 | 142,011
Fair Value | July 2024 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 107,142 | 105,755
Fair Value | July 2024 Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 107,142 | 105,755
Fair Value | February 2025 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 49,816 | 49,144
Fair Value | February 2025 Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 49,816 | 49,144
Fair Value | June 2025 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 68,046 | 67,198
Fair Value | June 2025 Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 68,046 | 67,198
Fair Value | June 2025 3-Year Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 49,199 | 48,983
Fair Value | June 2025 3-Year Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 49,199 | 48,983
Fair Value | March 2026 A Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 48,137 | 47,702
Fair Value | March 2026 A Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 48,137 | 47,702
Fair Value | March 2026 B Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 48,183 | 47,759
Fair Value | March 2026 B Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 48,183 | 47,759
Fair Value | September 2026 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 293,518 | 288,711
Fair Value | September 2026 Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 293,518 | 288,711
Fair Value | January 2027 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 319,515 | 315,832
Fair Value | January 2027 Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 319,515 | 315,832
Fair Value | 2031 Asset-Backed Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 142,500 | 142,500
Fair Value | 2031 Asset-Backed Notes | Observable Inputs (Level 2) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 142,500 | 142,500
Fair Value | 2033 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 39,840 | 40,400
Fair Value | 2033 Notes | Observable Inputs (Level 2) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 39,840 | 40,400
Fair Value | MUFG Bank Facility |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 133,000 | 61,000
Fair Value | MUFG Bank Facility | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 133,000 | 61,000
Fair Value | SMBC Facility |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 212,000 | 94,000
Fair Value | SMBC Facility | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | $ 212,000 | $ 94,000

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