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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Tax Credit Carryforward [Line Items] |  |  |
Income taxes, including excise tax expense | $ 2,007 | $ 611 | $ 7
Accumulated capital losses | 666,300 | 582,153 | $ 304,240
Cost of investments, income tax purposes | 2,534,400 | 2,565,900 |
Unrealized appreciation (depreciation) | (38,500) | (105,800) |
Unrealized gross appreciation | 124,800 | 112,400 |
Unrealized gross depreciation | 163,300 | 218,300 |
Deferred tax assets, investments | 9,900 | 9,500 |
Deferred tax assets, valuation allowance | 7,900 | 8,300 |
Short-Term Capital Loss Carryforward |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Accumulated capital losses | 37,000 | 27,100 |
Long-Term Capital Loss Carryforward |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Accumulated capital losses | $ 629,300 | $ 555,100 |

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