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INVESTMENTS - Schedule of Net Realized and Unrealized Gains (Losses) on Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on investments | $ 349,720 | $ (127,584) | $ 682,660 | $ (341,238)
Fixed maturity investments trading |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains on fixed maturity investments trading | 13,922 | 17,617 | 52,883 | 87,006
Gross realized losses on fixed maturity investments trading | (15,689) | (83,430) | (44,615) | (143,023)
Net realized gains (losses) on fixed maturity investments trading | (1,767) | (65,813) | 8,268 | (56,017)
Net unrealized gains (losses) on fixed maturity investments trading | 96,346 | (24,848) | 322,586 | (236,844)
Net realized and unrealized gains (losses) on fixed maturity investments trading | 94,579 | (90,661) | 330,854 | (292,861)
Derivatives |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on investment-related derivatives | 175,431 | 10,374 | 317,077 | (47,432)
Equity investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on equity investments | 64 | 15 | 72 | 15
Net unrealized gains (losses) on equity investments | 23,807 | (5,507) | 26,757 | 7,590
Net realized and unrealized gains (losses) on equity investments | 23,871 | (5,492) | 26,829 | 7,605
Catastrophe bonds |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on other investments | (14,016) | (34,107) | (54,429) | (15,200)
Other |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized and unrealized gains (losses) on other investments | $ 69,855 | $ (7,698) | $ 62,329 | $ 6,650

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments and relating to the entity's investment portfolio. + References No definition available. + Details
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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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