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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