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Investments - Schedule of Realized Gains and Losses and Changes in Unrealized Appreciation and Depreciation on Control and Affiliate investments (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Schedule Of Investments [Line Items] |  |  |  |
Investments, at fair value: | $ 3,571,641 |  | $ 3,248,046 |
Total fee income | 5,774 | $ 5,193 |  |
Total net change in unrealized appreciation (depreciation) | 3,634 | 21,105 |  |
Control investments |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Investments, at fair value: | 112,215 | 85,326 | $ 115,004 | $ 76,458
Total interest and dividend income | 2,957 | 1,116 |  |
Total fee income | 36 | 19 |  |
Total net change in unrealized appreciation (depreciation) | (2,829) | 8,846 |  |
Total net realized gain (loss) | 0 | 0 |  |
Control investments | Coronado Aesthetics, LLC |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Investments, at fair value: | 283 | 256 |  |
Total interest and dividend income | 0 | 0 |  |
Total fee income | 0 | 0 |  |
Total net change in unrealized appreciation (depreciation) | 21 | (63) |  |
Total net realized gain (loss) | 0 | 0 |  |
Control investments | Gibraltar Business Capital, LLC |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Investments, at fair value: | 57,931 | 40,701 |  |
Total interest and dividend income | 1,033 | 796 |  |
Total fee income | 36 | 19 |  |
Total net change in unrealized appreciation (depreciation) | (4,621) | 3,735 |  |
Total net realized gain (loss) | 0 | 0 |  |
Control investments | Hercules Adviser LLC |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Investments, at fair value: | 41,884 | 36,595 |  |
Total interest and dividend income | 1,752 | 150 |  |
Total fee income | 0 | 0 |  |
Total net change in unrealized appreciation (depreciation) | 1,171 | 5,442 |  |
Total net realized gain (loss) | 0 | 0 |  |
Control investments | Tectura Corporation |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Investments, at fair value: | 12,117 | 7,774 |  |
Total interest and dividend income | 172 | 170 |  |
Total fee income | 0 | 0 |  |
Total net change in unrealized appreciation (depreciation) | 600 | (268) |  |
Total net realized gain (loss) | $ 0 | $ 0 |  |

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