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INVESTMENTS - Schedule of Net Realized and Unrealized Gains (Losses) on Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on investments | $ 311,890 | $ 943,745 | $ 994,550 | $ 602,507
Fixed maturity investments trading |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on fixed maturity investments trading | 31,036 | 41,538 | 83,919 | 128,544
Gross realized losses on fixed maturity investments trading | (11,743) | (19,486) | (56,358) | (162,509)
Net realized gains (losses) on fixed maturity investments trading | 19,293 | 22,052 | 27,561 | (33,965)
Net unrealized gains (losses) on fixed maturity investments trading | 66,796 | 590,309 | 389,382 | 353,465
Net realized and unrealized gains (losses) on fixed maturity investments trading | 86,089 | 612,361 | 416,943 | 319,500
Derivatives |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on investment-related derivatives | 181,012 | 97,534 | 498,089 | 50,102
Equity investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on equity investments | 541 | 340 | 613 | 355
Net unrealized gains (losses) on equity investments | 6,609 | 18,778 | 33,366 | 26,368
Net realized and unrealized gains (losses) on equity investments | 7,150 | 19,118 | 33,979 | 26,723
Catastrophe bonds |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on other investments | 44,592 | 66,291 | (9,837) | 51,091
Other |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on other investments | $ (6,953) | $ 148,441 | $ 55,376 | $ 155,091

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- Definition Amount of unrealized and realized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity), investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + 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/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
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