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INVESTMENTS - Schedule of Net Realized and Unrealized Gains (Losses) on Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on fixed maturity investments trading	$ (246,423)	$ 292,054	$ (1,369,323)
Net realized and unrealized gains (losses) on equity investments	10,976	45,751	(123,788)
Net realized and unrealized gains (losses) on investments	(27,840)	414,522	(1,800,485)
Fixed maturity investments trading
Gain (Loss) on Securities [Line Items]
Gross realized gains on fixed maturity investments trading	142,243	80,905	38,781
Gross realized losses on fixed maturity investments trading	(206,172)	(473,946)	(771,342)
Net realized gains (losses) on fixed maturity investments trading	(63,929)	(393,041)	(732,561)
Net unrealized gains (losses) on fixed maturity investments trading	(182,494)	685,095	(636,762)
Investments-related derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments-related derivatives	(57,279)	(68,272)	(165,293)
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on equity investments	355	(27,492)	43,035
Net unrealized gains (losses) on equity investments	10,621	73,243	(166,823)
Catastrophe bonds
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on other investments	62,353	101,897	(130,335)
Other
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on other investments	$ 202,533	$ 43,092	$ (11,746)

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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.

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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).

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