OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications Out of AOCI Into Net Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items]
Other realized and unrealized investment gains (losses)	$ (25,350)	$ (13,863)
Impairment losses	(1,926)	(8)
Income before income taxes and interest in income of equity method investments	236,102	269,636
Income tax (expense) benefit	(44,322)	124,654
Net income	194,071	395,459
Unrealized gains (losses) on available for sale investments | Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items]
Other realized and unrealized investment gains (losses)	(32,384)	(24,871)
Impairment losses	(1,926)	(8)
Income before income taxes and interest in income of equity method investments	(34,310)	(24,879)
Income tax (expense) benefit	6,223	1,464
Net income	$ (28,087)	$ (23,415)