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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Tax Credit Carryforward [Line Items] |  |  |
Excise tax expense | $ 4,000 | $ 2,000 |
Accumulated capital losses | 702,514 | 666,300 | $ 582,153
Cost of investments, income tax purposes | 2,550,700 | 2,534,400 |
Unrealized depreciation | 50,500 | 38,500 |
Unrealized gross appreciation | 124,000 | 124,800 |
Unrealized gross depreciation | 174,500 | 163,300 |
Deferred tax asset | 11,000 | 9,900 |
Deferred tax assets, valuation allowance | 11,200 | 7,900 |
Short-Term Capital Loss Carryforward |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Accumulated capital losses | 34,400 | 37,000 |
Long-Term Capital Loss Carryforward |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Accumulated capital losses | $ 668,200 | $ 629,300 |

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