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Consolidated Financial Highlights (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2020
Investment Company, Financial Highlights [Line Items] |  |  |  |  |
Ratio of total expenses to average net assets | [1],[2],[3] | 19.45% | 18.87% | 15.62% | 14.00%
Ratio of non-interest expenses to average net assets | [1],[2],[3] | 8.92% | 7.38% | 8.83% | 8.40%
Expense reimbursement |  | $ 38,388 | $ 41,542 | $ 40,724 |
Expense Reimbursement [Member] |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |
Ratio of total expenses to average net assets |  |  | 20.90% |  |
Ratio of non-interest expenses to average net assets |  |  | 9.40% |  |
Expense reimbursement |  |  | $ 5,300 |  |
Percentage of net asset value return excluding expense reimbursement |  |  | 6.10% |  |
Externalization Agreement [Member] |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |
Incentive fees earned |  | 5,000 | $ 7,400 | 6,100 | $ 4,900
Incentive fees earned waived |  | $ 0 | $ 0 | $ 0 | $ 600
Ratio of total expenses to average net assets |  |  |  |  | 14.30%
Ratio of non-interest expenses to average net assets |  |  |  |  | 8.70%
[1] | Excluding the impact of the expense reimbursement of approximately $5.3 million during the year ended December 31, 2023, the ratio of total expenses to average net assets and the ratio of non-interest expenses to average net assets would have been 20.9% and 9.4%, respectively. In addition, the total net asset value return would have been 6.1%. excluding the expense reimbursement.
[2] | Incentive fees earned during the years ended December 31, 2024, December 31, 2023, and December 31, 2022 were approximately $5.0 million, $7.4 million, and $6.1 million, respectively, none of which was waived pursuant to the Externalization Agreement. Incentive fees earned during the year ended December 31, 2020, were approximately $4.9 million, of which $0.6 million was waived pursuant to the Externalization Agreement. Excluding the waiver, for the year ended December 31, 2020, ratio of total expenses to average net assets was 14.3% and the ratio of non-interest expenses to average net assets was 8.7%
[3] | Totals may not sum due to rounding.

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