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Investments - Fixed Income Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
AFS, Fair Value    
Due in one year or less fair value, AFS $ 582,163  
Due after one year through five years fair value, AFS 3,435,983  
Due after five years through 10 years fair value, AFS 2,833,659  
Due after 10 years fair value, AFS 731,699  
Total AFS fixed income securities, Fair Value 7,583,504 $ 7,499,197
HTM, Carrying Value    
Due in one year or less carrying value, HTM 0  
Due after one year through five years carrying value, HTM 15,716  
Due after five years through 10 years carrying value, HTM 4,579  
Due after 10 years carrying value, HTM 0  
Fixed income securities, held-to-maturity, net of allowance for credit losses 20,295 22,700
HTM, Fair Value    
Due in one year or less fair value, HTM 0  
Due after one year through five years fair value, HTM 14,898  
Due after five years through 10 years fair value, HTM 4,285  
Due after 10 years fair value, HTM 0  
Total HTM fixed income securities, Fair Value $ 19,183 $ 21,923