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Securities, at Fair Value - Impairment and Other Net Gain/(Loss) on Securities and Other Portfolio Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Gain (Loss) on Securities [Line Items] |  |  |  |
Total Impairment and other net gain/(loss) on securities and other portfolio investments | $ 22,928 | $ (14,161) | $ 15,310 | $ (15,799)
Securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net unrealized gain/(loss) on other portfolio investments | 16,890 | (13,439) | 9,591 | (14,205)
Net realized gain/(loss) on other portfolio investments | 7,324 | 0 | 9,992 | 0
Reversal/(Impairment) of securities or other portfolio investments | 0 | 0 | 0 | 0
Total Impairment and other net gain/(loss) on securities and other portfolio investments | 24,214 | (13,439) | 19,583 | (14,205)
Other Portfolio Investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net unrealized gain/(loss) on other portfolio investments | (1,286) | 7,482 | (4,273) | 6,610
Net realized gain/(loss) on other portfolio investments | 0 | (5,869) | 0 | (5,869)
Reversal/(Impairment) of securities or other portfolio investments | $ 0 | $ (2,335) | $ 0 | $ (2,335)

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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 8A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-8A + Details
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- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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