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Debt - Schedule of Available and Outstanding Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 | Jan. 31, 2023 | Jun. 23, 2022 | Jun. 22, 2022 | Jan. 20, 2022 | Sep. 16, 2021 | Mar. 04, 2021 | Nov. 04, 2020 | Jun. 03, 2020 | Feb. 05, 2020 | Jul. 16, 2019 | Sep. 24, 2018
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | $ 2,215,000 | $ 2,215,000 |  |  |  |  |  |  |  |  |  |  |
Principal |  | 1,760,000 | 1,570,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 1,747,127 | 1,554,869 |  |  |  |  |  |  |  |  |  |  |
SMBC LC Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 175,000 | 175,000 | $ 175,000 |  |  |  |  |  |  |  |  |  |
SBA Debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 175,000 | 175,000 |  |  |  |  |  |  |  |  |  |  |
Principal |  | 175,000 | 175,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 170,615 | 170,323 |  |  |  |  |  |  |  |  |  |  |
July 2024 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 105,000 | 105,000 |  |  |  |  |  |  |  |  |  | $ 105,000 |
Principal |  | 105,000 | 105,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 104,975 | 104,828 |  |  |  |  |  |  |  |  |  |  |
February 2025 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 50,000 | 50,000 |  |  |  |  |  |  |  |  | $ 50,000 |  |
Principal |  | 50,000 | 50,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 49,924 | 49,866 |  |  |  |  |  |  |  |  |  |  |
June 2025 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 70,000 | 70,000 |  |  |  |  |  |  |  | $ 70,000 |  |  |
Principal |  | 70,000 | 70,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 69,838 | 69,757 |  |  |  |  |  |  |  |  |  |  |
June 2025 3-Year Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 50,000 | 50,000 |  | $ 50,000 |  |  |  |  |  |  |  |  |
Principal |  | 50,000 | 50,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 49,848 | 49,771 |  |  |  |  |  |  |  |  |  |  |
March 2026 A Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 50,000 | 50,000 |  |  |  |  |  |  | $ 50,000 |  |  |  |
Principal |  | 50,000 | 50,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 49,842 | 49,795 |  |  |  |  |  |  |  |  |  |  |
March 2026 B Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 50,000 | 50,000 |  |  |  |  |  | $ 50,000 |  |  |  |  |
Principal |  | 50,000 | 50,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 49,828 | 49,776 |  |  |  |  |  |  |  |  |  |  |
September 2026 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 325,000 | 325,000 |  |  |  |  | $ 325,000 |  |  |  |  |  |
Principal |  | 325,000 | 325,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 322,830 | 322,339 |  |  |  |  |  |  |  |  |  |  |
January 2027 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 350,000 | 350,000 |  |  |  | $ 350,000 |  |  |  |  |  |  |
Principal |  | 350,000 | 350,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 346,600 | 345,935 |  |  |  |  |  |  |  |  |  |  |
2031 Asset-Backed Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 150,000 | 150,000 |  |  | $ 150,000 |  |  |  |  |  |  |  |
Principal |  | 150,000 | 150,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 148,838 | 148,544 |  |  |  |  |  |  |  |  |  |  |
2033 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 40,000 | 40,000 |  |  |  |  |  |  |  |  |  |  | $ 40,000
Principal |  | 40,000 | 40,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 38,989 | 38,935 |  |  |  |  |  |  |  |  |  |  |
MUFG Bank Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 400,000 | 400,000 |  |  |  |  |  |  |  |  |  |  |
Principal |  | 133,000 | 61,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 133,000 | 61,000 |  |  |  |  |  |  |  |  |  |  |
SMBC Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available | [1] | 400,000 | 400,000 |  |  |  |  |  |  |  |  |  |  |
Principal | [1] | 212,000 | 94,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value | [1] | $ 212,000 | $ 94,000 |  |  |  |  |  |  |  |  |  |  |
[1] | ncludes $175.0 million of available commitment through the letter of credit facility as of June 30, 2024 and December 31, 2023.

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