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Investments - Additional Information (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) Member | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Jan. 31, 2021 USD ($)
Investment Holdings [Line Items] |  |  |  |  |  |
CLO fund securities percentage of total assets | 3.90% |  | 3.90% |  | 4.90% |
Non qualified assets percentage of total assets | 15.30% |  | 15.30% |  | 15.80% |
Joint ventures percentage of total assets | 7.20% |  | 7.20% |  | 9.30% |
Fair Value | $ 571,656,000 |  | $ 571,656,000 |  | $ 549,985,000 |
Unfunded commitment to investee | 54,394,000 |  | 54,394,000 |  | 47,900,000 |
Catamaran 2016-1 |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Notional amount sold |  |  |  |  |  | $ 10,100,000
Notional amount of subordinated notes |  |  |  |  |  | $ 3,300,000
Level II |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Fair Value | 65,200,000 |  | $ 65,200,000 |  | 42,900,000 |
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 | 2,200,000 | $ 2,400,000 | $ 6,400,000 | $ 7,000.0 |  |
Aggregate fair value of investments in joint venture | $ 45,100,000 |  | $ 45,100,000 |  | 60,500,000 |
F3C Joint Venture |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
F3C Joint venture ownership percentage | 62.80% |  | 62.80% |  |  |
Number of board of directors | Member |  |  | 4 |  |  |
Directors selected by company | Member |  |  | 2 |  |  |
Directors selected by Freedom 3 Opportunities | Member |  |  | 2 |  |  |
Series A-Great Lakes Funding II LLC |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |
Percentage of voting interest | 50.00% |  | 50.00% |  |  |
Fair Value | $ 27,000,000.0 |  | $ 27,000,000.0 |  | 37,400,000 |
Unfunded commitment to investee | $ 21,700,000 |  | $ 21,700,000 |  | $ 13,000,000.0 |

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- Definition Fair value portion of investments in an entity not consolidated. Includes, but is not limited to, investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, an entity in which the reporting entity shares control of the entity with another party or group, an entity which the company has significant influence, but does not have control and subsidiaries that are not required to be consolidated and are accounted for using the equity or cost method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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