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Transactions with Affiliated Companies - Summary of Transactions with Affiliated Companies (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2022
Investments In And Advances To Affiliates [Line Items] |  |  |
Net Realized Gains (Losses) | $ 63 | $ 3,138 |
Controlled, Affiliated Investments |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |
Fair Value | 280,396 |  | $ 271,005
Gross Additions |  |  | 13,455
Net Change in Unrealized Appreciation (Depreciation) |  |  | (4,064)
Interest Income | 6,909 |  |
Dividend/Other Income | 2,975 |  |
Controlled, Affiliated Investments | Marketplace Events, LLC |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |
Fair Value | 32,732 |  | 31,390
Gross Additions |  |  | 330
Net Change in Unrealized Appreciation (Depreciation) |  |  | 1,012
Interest Income | 950 |  |
Controlled, Affiliated Investments | Loan Fund I LLC |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |
Fair Value | 247,664 |  | 239,615
Gross Additions |  |  | 13,125
Net Change in Unrealized Appreciation (Depreciation) |  |  | $ (5,076)
Interest Income | 5,959 |  |
Dividend/Other Income | $ 2,975 |  |

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