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Consolidated Financial Highlights (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Investment Company, Financial Highlights [Line Items] |  |  |  |
Ratio of total expenses to average net assets | [1] | 15.60% | 15.20% | 14.00%
Ratio of non-interest expenses to average net assets | [1] | 8.80% | 9.70% | 8.40%
Externalization Agreement [Member] |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |
Incentive fees earned |  | $ 6,100 | $ 7,100 | $ 4,900
Incentive fees earned waived |  | $ 0 | $ 0 | $ 557
Ratio of total expenses to average net assets |  |  |  | 14.30%
Ratio of non-interest expenses to average net assets |  |  |  | 8.70%
[1] | Totals may not sum due to rounding.

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- Definition Percentage, after deduction of fee waiver and incentive fee, of expense to average net assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=25866437&loc=d3e10351-115837 + Details
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