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Investments - Additional Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2022 USD ($) Member	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 31, 2021 USD ($)
Investment Holdings [Line Items]
CLO fund securities percentage of total assets			3.30%	4.90%
Non qualified assets percentage of total assets			17.60%	15.80%
Joint ventures percentage of total assets			9.50%	9.30%
Fair Value			$ 576,478	$ 549,985
Unfunded commitment to investee			34,959	47,899
Middle-market Loans
Investment Holdings [Line Items]
Purchase (sale) of middle-market loans		$ 147,000
Great Lakes KCAP F3C Senior, LLC
Investment Holdings [Line Items]
Percentage of subordinated notes purchased	100.00%
Cash distribution received for refinancing	$ 12,600
Distribution on return of capital	$ 11,800
Great Lakes KCAP F3C Senior, LLC | Middle-market Loans
Investment Holdings [Line Items]
Purchase (sale) of middle-market loans		184,000
Catamaran 2016-1
Investment Holdings [Line Items]
Notional amount sold						$ 10,100
Notional amount of subordinated notes						$ 3,300
Level II
Investment Holdings [Line Items]
Fair Value			$ 65,000	42,900
Non Qualifying Assets
Investment Holdings [Line Items]
Investment portfolio percentage			30.00%
Joint venture
Investment Holdings [Line Items]
Investment income from investments in joint ventures			$ 8,600	9,200	$ 6,900
Aggregate fair value of investments in joint venture			$ 59,000	60,500
F3C Joint Venture
Investment Holdings [Line Items]
Amount contributed in assets of Joint venture		37,000
F3C Joint venture ownership percentage			62.80%
Number of board of directors | Member			4
Directors selected by company | Member			2
Directors selected by Freedom 3 Opportunities | Member			2
BCP Great Lakes Partnership LP
Investment Holdings [Line Items]
Fair Value			$ 40,300	37,400
Series A-Great Lakes Funding II LLC
Investment Holdings [Line Items]
Percentage of voting interest			50.00%
Fair Value			$ 40,300	37,400
Increase in aggregate commitment to investee			50,000
Unfunded commitment to investee			$ 8,000	$ 13,000
Freedom 3 Opportunities | F3C Joint Venture
Investment Holdings [Line Items]
Amount contributed in assets of Joint venture		$ 25,000

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