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Investments - Summary of Fair Value of Investments by Fair Value Hierarchy Levels (Details) - ASC 820 - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair value of investments | $ 471,255 | $ 467,865
Level II |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair value of investments | 65,961 | 65,325
Level III |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair value of investments | 365,653 | 357,528
NAV |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair value of investments | 39,641 | 45,012
Debt securities |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair value of investments | 386,114 | 379,077
Debt securities | Level II |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair value of investments | 65,961 | 65,325
Debt securities | Level III |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair value of investments | 320,153 | 313,752
Equity Securities |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair value of investments | 23,428 | 20,533
Equity Securities | Level III |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair value of investments | 23,428 | 20,533
CLO Fund Securities |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair value of investments | 8,549 | 8,968
CLO Fund Securities | Level III |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair value of investments | 8,549 | 8,968
Joint Ventures |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair value of investments | 53,164 | 59,287
Joint Ventures | Level III |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair value of investments | 13,523 | 14,275
Joint Ventures | NAV |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair value of investments | $ 39,641 | $ 45,012

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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