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INVESTMENTS - Fixed Maturity Securities (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]    
Fair value $ 11,326,894 $ 12,313,200
Non-U.S. government    
Schedule Of Available For Sale Securities [Line Items]    
Unrealized losses 52,912 9,685
Foreign exchange loss (24,000)  
Fair value 562,029 795,178
CMBS    
Schedule Of Available For Sale Securities [Line Items]    
Unrealized losses 82,145 4,687
Fair value $ 947,778 $ 1,248,191
CMBS | Weighted average    
Schedule Of Available For Sale Securities [Line Items]    
Subordination percentage input for determining credit losses 38.00% 37.00%
Non-agency RMBS    
Schedule Of Available For Sale Securities [Line Items]    
Unrealized losses $ 18,525 $ 2,023
Fair value 133,534 186,164
Non-agency RMBS | Prime    
Schedule Of Available For Sale Securities [Line Items]    
Fair value 39,000 87,000
Non-agency RMBS | Alt A    
Schedule Of Available For Sale Securities [Line Items]    
Fair value $ 76,000 $ 74,000