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Investments - Available-for-Sale Allowance for Credit Losses Roll Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses, period beginning balance $ 28,212 $ 45,721
Current Provision for Securities without Prior Allowance 1,116 3,730
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities 1,534 (13,259)
Reductions for Securities Sold (472) (2,627)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period (9) (11)
Allowance for credit losses, period ending balance 30,381 33,554
Foreign government    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses, period beginning balance 35 284
Current Provision for Securities without Prior Allowance 0 0
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities 0 (248)
Reductions for Securities Sold (6) 0
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0
Allowance for credit losses, period ending balance 29 36
Obligations of states and political subdivisions    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses, period beginning balance 669 1,024
Current Provision for Securities without Prior Allowance 9 50
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities 25 (254)
Reductions for Securities Sold (8) (83)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0
Allowance for credit losses, period ending balance 695 737
Corporate securities    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses, period beginning balance 12,999 30,330
Current Provision for Securities without Prior Allowance 1,015 2,854
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities 1,792 (13,964)
Reductions for Securities Sold (355) (2,453)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period (9) (11)
Allowance for credit losses, period ending balance 15,442 16,756
CLO and other ABS    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses, period beginning balance 2,854 2,375
Current Provision for Securities without Prior Allowance 90 787
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities (314) 736
Reductions for Securities Sold (3) (3)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0
Allowance for credit losses, period ending balance 2,627 3,895
RMBS    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses, period beginning balance 11,649 11,597
Current Provision for Securities without Prior Allowance 0 12
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities 31 219
Reductions for Securities Sold (100) (88)
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0
Allowance for credit losses, period ending balance 11,580 11,740
CMBS    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses, period beginning balance 6 111
Current Provision for Securities without Prior Allowance 2 27
Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration 0 0
Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities 0 252
Reductions for Securities Sold 0 0
Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period 0 0
Allowance for credit losses, period ending balance $ 8 $ 390