INVESTMENTS - Schedule of Net Realized and Unrealized Gains (Losses) on Fixed Maturity Investments Trading and Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Fixed maturity investments trading
Fixed maturity investments trading
Debt Securities, Trading, Realized Gain (Loss)	$ (137,500)	$ 19,293	$ (175,836)	$ 27,561
Debt Securities, Trading, Unrealized Gain (Loss)	(693,971)	66,796	(1,012,279)	389,382
Fixed maturity investments trading	(831,471)	86,089	(1,188,115)	416,943
Equity investments
Equity investments
Net realized gains (losses)	(721)	541	8,346	613
Net unrealized gains (losses)	(78,245)	6,609	(140,297)	33,366
Equity investments	$ (78,966)	$ 7,150	$ (131,951)	$ 33,979

Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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