OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Reclassifications Out of AOCI Into Net Income Available to Common Shareholders (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items]
Impairment losses	$ (408)	$ (12,757)	$ (12,568)
Income before income taxes and interest in income of equity method investments	1,008,238	398,445	243,125
Income tax (expense) benefit	55,595	(26,316)	(22,037)
Net income	1,081,786	376,292	223,083
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains (losses) on available for sale investments
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items]
Other realized and unrealized investment gains (losses)	(170,576)	(129,567)	(322,726)
Impairment losses	(408)	(12,757)	(12,568)
Income before income taxes and interest in income of equity method investments	(170,984)	(142,324)	(335,294)
Income tax (expense) benefit	15,664	13,811	30,369
Net income	$ (155,320)	$ (128,513)	$ (304,925)