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INVESTMENTS - Fixed Maturity Securities (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Fair value	$ 12,234,742	$ 11,326,894
Non-U.S. government
Schedule Of Available For Sale Securities [Line Items]
Unrealized loss position	(18,861)	(52,912)
Foreign exchange losses	6,000	24,000
Fair value	723,959	562,029
CMBS
Schedule Of Available For Sale Securities [Line Items]
Unrealized loss position	(58,408)	(82,145)
Fair value	$ 839,696	$ 947,778
CMBS | Weighted average
Schedule Of Available For Sale Securities [Line Items]
Subordination percentage input for determining credit losses	37.00%	38.00%
Non-agency RMBS
Schedule Of Available For Sale Securities [Line Items]
Unrealized loss position	$ (13,033)	$ (18,525)
Fair value	153,396	133,534
Non-agency RMBS | Prime
Schedule Of Available For Sale Securities [Line Items]
Fair value	34,000	39,000
Non-agency RMBS | Alt A
Schedule Of Available For Sale Securities [Line Items]
Fair value	$ 100,000	$ 76,000

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