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Debt - Schedule of Available and Outstanding Debt (Details) - USD ($) | Mar. 31, 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
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | $ 2,215,000,000 | $ 2,215,000,000 |  |  |  |  |  |  |  |  |  |  |
Principal |  | 1,766,000,000 | 1,570,000,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 1,751,998,000 | 1,554,869,000 |  |  |  |  |  |  |  |  |  |  |
SMBC LC Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 175,000,000 | 175,000,000 | $ 175,000,000 |  |  |  |  |  |  |  |  |  |
SBA Debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 175,000,000 | 175,000,000 |  |  |  |  |  |  |  |  |  |  |
Principal |  | 175,000,000 | 175,000,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 170,469,000 | 170,323,000 |  |  |  |  |  |  |  |  |  |  |
July 2024 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 105,000,000 | 105,000,000 |  |  |  |  |  |  |  |  |  | $ 105,000,000 |
Principal |  | 105,000,000 | 105,000,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 104,902,000 | 104,828,000 |  |  |  |  |  |  |  |  |  |  |
February 2025 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |  | $ 50,000,000 |  |
Principal |  | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 49,895,000 | 49,866,000 |  |  |  |  |  |  |  |  |  |  |
June 2025 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 70,000,000 | 70,000,000 |  |  |  |  |  |  |  | $ 70,000,000 |  |  |
Principal |  | 70,000,000 | 70,000,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 69,798,000 | 69,757,000 |  |  |  |  |  |  |  |  |  |  |
June 2025 3-Year Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 50,000,000 | 50,000,000 |  | $ 50,000,000 |  |  |  |  |  |  |  |  |
Principal |  | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 49,810,000 | 49,771,000 |  |  |  |  |  |  |  |  |  |  |
March 2026 A Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 50,000,000 | 50,000,000 |  |  |  |  |  |  | $ 50,000,000 |  |  |  |
Principal |  | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 49,818,000 | 49,795,000 |  |  |  |  |  |  |  |  |  |  |
March 2026 B Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 50,000,000 | 50,000,000 |  |  |  |  |  | $ 50,000,000 |  |  |  |  |
Principal |  | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 49,802,000 | 49,776,000 |  |  |  |  |  |  |  |  |  |  |
September 2026 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 325,000,000 | 325,000,000 |  |  |  |  | $ 325,000,000 |  |  |  |  |  |
Principal |  | 325,000,000 | 325,000,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 322,585,000 | 322,339,000 |  |  |  |  |  |  |  |  |  |  |
January 2027 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 350,000,000 | 350,000,000 |  |  |  | $ 350,000,000 |  |  |  |  |  |  |
Principal |  | 350,000,000 | 350,000,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 346,266,000 | 345,935,000 |  |  |  |  |  |  |  |  |  |  |
2031 Asset-Backed Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 150,000,000 | 150,000,000 |  |  | $ 150,000,000 |  |  |  |  |  |  |  |
Principal |  | 150,000,000 | 150,000,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 148,691,000 | 148,544,000 |  |  |  |  |  |  |  |  |  |  |
2033 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 40,000,000 | 40,000,000 |  |  |  |  |  |  |  |  |  |  | $ 40,000,000
Principal |  | 40,000,000 | 40,000,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 38,962,000 | 38,935,000 |  |  |  |  |  |  |  |  |  |  |
MUFG Bank Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available |  | 400,000,000 | 400,000,000 |  |  |  |  |  |  |  |  |  |  |
Principal |  | 136,000,000 | 61,000,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 136,000,000 | 61,000,000 |  |  |  |  |  |  |  |  |  |  |
SMBC Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Available | [1] | 400,000,000 | 400,000,000 |  |  |  |  |  |  |  |  |  |  |
Principal | [1] | 215,000,000 | 94,000,000 |  |  |  |  |  |  |  |  |  |  |
Carrying value | [1] | $ 215,000,000 | $ 94,000,000 |  |  |  |  |  |  |  |  |  |  |
[1] | Includes $175.0 million of available commitment through the letter of credit facility as of March 31, 2024 and December 31, 2023.

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