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Financial Highlights - Summary of Information about Senior Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Oct. 27, 2021
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Convertible Notes | $ 49,395 | $ 48,757 |  |  |  |
Total | 888,000 | 645,500 | $ 620,000 | $ 466,000 | $ 310,000 |
2025 Notes |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Total | 152,500 |  |  |  |  |
KeyBank Credit Facility |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Credit facility | 113,000 | 213,000 |  |  |  | $ 600,000
Senior Securities |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Credit facility | 888,000 | 645,500 | 620,000 | 466,000 | 310,000 |
Asset Coverage per Unit | 1,927 | 1,947 | 1,741 | 1,958 | 1,770 |
Senior Securities | 2025 Notes |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Credit facility | 152,500 | 182,500 | 182,500 | 125,000 | 125,000 |
Asset Coverage per Unit | 1,927 | 1,947 | 1,741 | 1,958 | 1,770 |
Average Market Value per Unit | 1,009 | 1,006 | 1,006 |  |  |
Senior Securities | Convertible Notes |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Credit facility | 50,000 | 50,000 | 50,000 | 50,000 | 50,000 |
Asset Coverage per Unit | 1,927 | 1,947 | 1,741 | 1,958 | 1,770 |
Senior Securities | August 2026 Notes |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Credit facility | 125,000 | 125,000 | 125,000 | 125,000 |  |
Asset Coverage per Unit | 1,927 | 1,947 | 1,741 | 1,958 |  |
Senior Securities | December 2026 Notes |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Credit facility | 75,000 | 75,000 | 75,000 | 75,000 |  |
Asset Coverage per Unit | 1,927 | 1,947 | 1,741 | 1,958 |  |
Senior Securities | March 2029 Notes |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Credit facility | 115,000 |  |  |  |  |
Asset Coverage per Unit | 1,927 |  |  |  |  |
Average Market Value per Unit | 1,012 |  |  |  |  |
Senior Securities | September 2029 Notes |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Credit facility | 115,000 |  |  |  |  |
Asset Coverage per Unit | 1,927 |  |  |  |  |
Average Market Value per Unit | 1,014 |  |  |  |  |
Senior Securities | Series A Notes |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Credit facility | 142,500 |  |  |  |  |
Asset Coverage per Unit | 1,927 |  |  |  |  |
Senior Securities | Credit Suisse Credit Facility |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Credit facility |  |  |  | 10,000 | 135,000 |
Asset Coverage per Unit |  |  |  | 1,958 | $ 1,770 |
Senior Securities | KeyBank Credit Facility |  |  |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |  |  |  |  |
Credit facility | 113,000 | 213,000 | 187,500 | 81,000 |  |
Asset Coverage per Unit | $ 1,927 | $ 1,947 | $ 1,741 | $ 1,958 |  |

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