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Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy of Outstanding Borrowings (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | $ 1,976,623 | $ 1,768,955
Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 1,976,623 | 1,768,955
Carrying Value | SBA Debentures |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 287,049 | 271,371
Carrying Value | February 2025 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value |  | 49,981
Carrying Value | June 2025 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 69,960 | 69,919
Carrying Value | June 2025 3-Year Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 49,965 | 49,926
Carrying Value | March 2026 A Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 49,913 | 49,889
Carrying Value | March 2026 B Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 49,905 | 49,880
Carrying Value | September 2026 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 323,566 | 323,321
Carrying Value | January 2027 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 347,598 | 347,265
Carrying Value | 2028 Convertible Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 278,503 |
Carrying Value | 2031 Asset-Backed Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 116,272 | 118,769
Carrying Value | 2033 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 39,070 | 39,043
Carrying Value | MUFG Bank Facility |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 105,000 | 116,000
Carrying Value | SMBC Facility |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value | 259,822 | 283,591
Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 1,924,296 | 1,713,360
Fair Value | Observable Inputs (Level 2) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 435,910 | 155,303
Fair Value | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 1,488,386 | 1,558,057
Fair Value | SBA Debentures |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 268,236 | 260,436
Fair Value | SBA Debentures | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 268,236 | 260,436
Fair Value | February 2025 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value |  | 50,698
Fair Value | February 2025 Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value |  | 50,698
Fair Value | June 2025 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 70,637 | 69,308
Fair Value | June 2025 Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 70,637 | 69,308
Fair Value | June 2025 3-Year Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 50,678 | 49,713
Fair Value | June 2025 3-Year Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 50,678 | 49,713
Fair Value | March 2026 A Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 49,012 | 49,052
Fair Value | March 2026 A Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 49,012 | 49,052
Fair Value | March 2026 B Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 49,036 | 49,087
Fair Value | March 2026 B Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 49,036 | 49,087
Fair Value | September 2026 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 305,377 | 302,244
Fair Value | September 2026 Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 305,377 | 302,244
Fair Value | January 2027 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 330,404 | 327,928
Fair Value | January 2027 Notes | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 330,404 | 327,928
Fair Value | 2028 Convertible Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 282,109 |
Fair Value | 2028 Convertible Notes | Observable Inputs (Level 2) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 282,109 |
Fair Value | 2031 Asset-Backed Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 113,433 | 115,031
Fair Value | 2031 Asset-Backed Notes | Observable Inputs (Level 2) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 113,433 | 115,031
Fair Value | 2033 Notes |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 40,368 | 40,272
Fair Value | 2033 Notes | Observable Inputs (Level 2) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 40,368 | 40,272
Fair Value | MUFG Bank Facility |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 105,000 | 116,000
Fair Value | MUFG Bank Facility | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 105,000 | 116,000
Fair Value | SMBC Facility |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 260,006 | 283,591
Fair Value | SMBC Facility | Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | $ 260,006 | $ 283,591

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