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Investments - Summary of Investments in CLO Fund Securities (Details) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022
Summary of Investment Holdings [Line Items]
Cost/Amortized Cost		$ 620,821	$ 652,217
Fair Value		539,122	576,478
CLO Fund Securities
Summary of Investment Holdings [Line Items]
Cost/Amortized Cost		30,860	34,649
Fair Value		$ 19,241	20,453
CLO Fund Securities | Subordinated Notes | Catamaran CLO 2014-1 Ltd.
Summary of Investment Holdings [Line Items]
Percentage of class held	[1]	22.00%
Cost/Amortized Cost		$ 4,314	4,216
Fair Value		$ 3,297	3,232
CLO Fund Securities | Subordinated Notes | Catamaran CLO 2014-2 Ltd.
Summary of Investment Holdings [Line Items]
Percentage of class held	[1]	25.00%
Cost/Amortized Cost		$ 6,066	6,066
CLO Fund Securities | Subordinated Notes | Catamaran CLO 2015-1 Ltd.
Summary of Investment Holdings [Line Items]
Percentage of class held	[1]	10.00%
Cost/Amortized Cost		$ 2,534	2,534
CLO Fund Securities | Subordinated Notes | Catamaran CLO 2018-1 Ltd.
Summary of Investment Holdings [Line Items]
Percentage of class held	[1]	25.00%
Cost/Amortized Cost		$ 6,269	6,338
Fair Value		$ 5,284	4,753
CLO Fund Securities | Subordinated Notes | Dryden 30 Senior Loan Fund
Summary of Investment Holdings [Line Items]
Percentage of class held	[1]	7.00%
Cost/Amortized Cost		$ 896	868
Fair Value		$ 846	868
CLO Fund Securities | Subordinated Notes | JMP CLO IV Junior Sub Note
Summary of Investment Holdings [Line Items]
Percentage of class held	[1]	57.00%
Cost/Amortized Cost		$ 4,262	4,020
Fair Value		$ 3,295	4,020
CLO Fund Securities | Subordinated Notes | JMP CLO V Junior Sub Note
Summary of Investment Holdings [Line Items]
Percentage of class held	[1]	57.00%
Cost/Amortized Cost		$ 6,519	10,607
Fair Value		$ 6,519	$ 7,580
[1] Represents percentage of class held at March 31, 2023.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 946
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-Section S99
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