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Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Of Outstanding Borrowings (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | $ 1,632,738 | $ 1,574,351
Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | 1,632,738 | 1,574,351
Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 1,487,649 | 1,434,445
SBA Debentures | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | 170,175 | 169,738
SBA Debentures | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 148,274 | 155,257
July 2024 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | 104,754 | 104,533
July 2024 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 102,783 | 102,019
February 2025 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | 49,837 | 49,751
February 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 47,443 | 47,044
June 2025 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | 69,717 | 69,595
June 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 66,096 | 64,198
June 2025 3-Year Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | 49,732 | 49,616
June 2025 3-Year Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 48,541 | 47,528
March 2026 A Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | 49,771 | 49,700
March 2026 A Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 45,482 | 45,512
March 2026 B Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | 49,751 | 49,673
March 2026 B Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 45,537 | 45,588
September 2026 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | 322,094 | 321,358
September 2026 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 273,407 | 269,509
January 2027 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | 345,602 | 344,604
January 2027 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 298,106 | 296,826
2031 Asset-Backed Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | 148,397 | 147,957
2031 Asset-Backed Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 139,500 | 142,620
2033 Notes | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | 38,908 | 38,826
2033 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 38,480 | 39,344
MUFG Bank Facility | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | 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] |  |
Debt (net of debt issuance costs - Note 5; amounts related to a VIE $147,663 and $0, respectively) | 173,000 | 72,000
SMBC Facility | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 173,000 | 72,000
Observable Inputs (Level 2) | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 177,980 | 181,964
Observable Inputs (Level 2) | 2031 Asset-Backed Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 139,500 | 142,620
Observable Inputs (Level 2) | 2033 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 38,480 | 39,344
Unobservable Inputs (Level 3) | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 1,309,669 | 1,252,481
Unobservable Inputs (Level 3) | SBA Debentures | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 148,274 | 155,257
Unobservable Inputs (Level 3) | July 2024 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 102,783 | 102,019
Unobservable Inputs (Level 3) | February 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 47,443 | 47,044
Unobservable Inputs (Level 3) | June 2025 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 66,096 | 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 | 48,541 | 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 | 45,482 | 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 | 45,537 | 45,588
Unobservable Inputs (Level 3) | September 2026 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 273,407 | 269,509
Unobservable Inputs (Level 3) | January 2027 Notes | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Approximate Fair Value | 298,106 | 296,826
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 | $ 173,000 | $ 72,000

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