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Joint Venture - Schedule of Operations Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Total investment income | $ 61,357 |  |  |  | $ 58,496 |  | $ 134,911 | $ 123,471 | $ 251,010
Net change in unrealized (depreciation) appreciation on investments | 19,692 | $ (16,412) | $ 29,585 | $ 25,606 | 23,406 | $ (56,378) | 3,280 | (32,972) | 22,219
CION/EagleTree |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |
Total investment income | 1,143 |  |  |  | 1,468 |  | 2,445 | 3,063 | 6,230
Total expenses | 2,173 |  |  |  | 2,566 |  | 4,691 | 5,258 | 10,213
Net realized gain (loss) on investments | 3,325 |  |  |  | 0 |  | 3,325 | 176 | (2,083)
Net change in unrealized (depreciation) appreciation on investments | (4,291) |  |  |  | 409 |  | (9,874) | 446 | 4,338
Net decrease in net assets | $ (1,996) |  |  |  | $ (689) |  | $ (8,795) | $ (1,573) | $ (1,728)

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