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Investments - Summary of Fair Value of Investments by Fair Value Hierarchy Levels (Details) - ASC 820 - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	$ 571,656	$ 547,573
Level I
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	1,317	1,594
Level II
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	65,152	42,861
Level III
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	478,236	465,706
NAV
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	26,951	37,412
Debt securities
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	477,397	435,293
Debt securities | Level II
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	65,152	42,861
Debt securities | Level III
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	412,245	392,432
Equity Securities
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	24,487	22,586
Equity Securities | Level I
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	1,317	1,594
Equity Securities | Level III
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	23,170	20,992
CLO Fund Securities
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	24,623	31,632
CLO Fund Securities | Level III
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	24,623	31,632
Joint Ventures
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	45,141	60,474
Joint Ventures | Level III
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	18,190	23,062
Joint Ventures | NAV
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	26,951	37,412
Derivatives
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	8	(2,412)
Derivatives | Level III
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value of investments	$ 8	$ (2,412)

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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