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INVESTMENTS - Schedule of Components of Net Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Investment income before investment expenses | $ 445,064 | $ 429,441 | $ 1,277,017 | $ 1,242,350
Investment expenses | (6,710) | (5,582) | (20,202) | (16,871)
Net investment income | 438,354 | 423,859 | 1,256,815 | 1,225,479
Fixed maturity investments trading |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Investment income before investment expenses | 287,139 | 289,687 | 854,035 | 820,876
Short term investments |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Investment income before investment expenses | 51,855 | 46,746 | 141,299 | 141,923
Fixed income exchange traded funds |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Investment income before investment expenses | 15,876 | 0 | 23,588 | 0
Other equity investments |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Investment income before investment expenses | 610 | 670 | 1,951 | 1,819
Catastrophe bonds |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Investment income before investment expenses | 50,503 | 61,175 | 153,205 | 177,860
Other |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Investment income before investment expenses | 27,036 | 20,937 | 67,451 | 59,525
Cash and cash equivalents |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Investment income before investment expenses | $ 12,045 | $ 10,226 | $ 35,488 | $ 40,347

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