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INVESTMENTS - Fixed Maturity Securities (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items] |  |
Fair value | $ 12,152,753 | $ 12,234,742
Non-U.S. government |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Unrealized loss position | (25,960) | (18,861)
Foreign exchange loss | (19,000) | (6,000)
Fair value | 729,939 | 723,959
CMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Unrealized loss position | (34,170) | (58,408)
Fair value | $ 819,608 | $ 839,696
CMBS | Weighted average |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Subordination percentage input for determining credit losses | 34.00% | 37.00%
Non-agency RMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Unrealized loss position | $ (9,982) | $ (13,033)
Fair value | 122,536 | 153,396
Non-agency RMBS | Prime |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair value | 15,000 | 34,000
Non-agency RMBS | Alt A |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair value | $ 92,000 | $ 100,000

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