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INVESTMENTS - Schedule of Net Realized and Unrealized Gains (Losses) on Investments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized gains (losses) on investments | $ 332,940 | $ (213,654)
Fixed maturity investments trading |  |
Gain (Loss) on Securities [Line Items] |  |
Gross realized gains on fixed maturity investments trading | 38,961 | 69,389
Gross realized losses on fixed maturity investments trading | (28,926) | (59,593)
Net realized gains (losses) on fixed maturity investments trading | 10,035 | 9,796
Net unrealized gains (losses) on fixed maturity investments trading | 226,240 | (211,996)
Net realized and unrealized gains (losses) on fixed maturity investments trading | 236,275 | (202,200)
Derivatives |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized gains (losses) on investment-related derivatives | 141,646 | (57,806)
Equity investments |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized gains (losses) on equity investments | 8 | 0
Net unrealized gains (losses) on equity investments | 2,950 | 13,097
Net realized and unrealized gains (losses) on equity investments | 2,958 | 13,097
Catastrophe bonds |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized gains (losses) on other investments | (40,413) | 18,907
Other |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized and unrealized gains (losses) on other investments | $ (7,526) | $ 14,348

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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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