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INVESTMENTS - Fixed Maturities Available For Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Available for sale
Amortized cost	$ 12,419,905	$ 12,634,254
Allowance for expected credit losses	(3,938)	(10,759)	$ (11,733)	$ (313)
Gross unrealized gains	48,121	91,762
Gross unrealized losses	(311,335)	(480,515)
Fair value	12,152,753	12,234,742
U.S. government and agency
Available for sale
Amortized cost	2,830,111	3,049,445
Allowance for expected credit losses	0	0
Gross unrealized gains	6,011	13,211
Gross unrealized losses	(33,136)	(55,128)
Fair value	2,802,986	3,007,528
Non-U.S. government
Available for sale
Amortized cost	753,315	729,761
Allowance for expected credit losses	0	(30)
Gross unrealized gains	2,584	13,089
Gross unrealized losses	(25,960)	(18,861)
Fair value	729,939	723,959
Corporate debt
Available for sale
Amortized cost	4,941,510	4,651,654
Allowance for expected credit losses	(3,690)	(10,438)
Gross unrealized gains	30,594	49,434
Gross unrealized losses	(126,224)	(216,478)
Fair value	4,842,190	4,474,172
Agency RMBS
Available for sale
Amortized cost	1,245,681	1,706,204
Allowance for expected credit losses	0	0
Gross unrealized gains	1,154	11,495
Gross unrealized losses	(61,990)	(83,038)
Fair value	1,184,845	1,634,661
CMBS
Available for sale
Amortized cost	852,534	897,553
Allowance for expected credit losses	0	0
Gross unrealized gains	1,244	551
Gross unrealized losses	(34,170)	(58,408)
Fair value	819,608	839,696
Non-agency RMBS
Available for sale
Amortized cost	132,116	165,910
Allowance for expected credit losses	(195)	(194)
Gross unrealized gains	597	713
Gross unrealized losses	(9,982)	(13,033)
Fair value	122,536	153,396
ABS
Available for sale
Amortized cost	1,547,350	1,265,187
Allowance for expected credit losses	(53)	(50)
Gross unrealized gains	5,812	2,855
Gross unrealized losses	(13,277)	(25,021)
Fair value	1,539,832	1,242,971
Municipals
Available for sale
Amortized cost	117,288	168,540
Allowance for expected credit losses	0	(47)
Gross unrealized gains	125	414
Gross unrealized losses	(6,596)	(10,548)
Fair value	$ 110,817	$ 158,359