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Investments - Amortized Cost and Fair Values of Debt Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Amortized cost    
Due in one year or less $ 728,611  
Due after one year through five years 1,567,925  
Due after five years through ten years 1,816,994  
Due after ten years 1,006,418  
Total debt securities with single maturity date, amortized cost 5,119,948  
Amortized Cost 6,161,970 $ 6,061,022
Fair Value    
Due in one year or less 727,027  
Due after one year through five years 1,554,767  
Due after five years through ten years 1,744,159  
Due after ten years 909,207  
Total debt securities with single maturity date, fair value 4,935,160  
Total at end of period 5,964,065 5,723,113
ABS    
Amortized cost    
Total debt securities without single maturity date, amortized cost 156,008  
Amortized Cost 156,008 173,256
Fair Value    
Total debt securities without single maturity date, fair value 157,950  
Total at end of period 157,950 171,273
RMBS    
Amortized cost    
Total debt securities without single maturity date, amortized cost 379,184  
Amortized Cost 379,184 347,132
Fair Value    
Total debt securities without single maturity date, fair value 370,435  
Total at end of period 370,435 330,773
CMBS    
Amortized cost    
Total debt securities without single maturity date, amortized cost 270,014  
Amortized Cost 270,014 293,204
Fair Value    
Total debt securities without single maturity date, fair value 263,536  
Total at end of period 263,536 277,457
CLOs    
Amortized cost    
Total debt securities without single maturity date, amortized cost 236,816  
Amortized Cost 236,816 327,467
Fair Value    
Total debt securities without single maturity date, fair value 236,984  
Total at end of period $ 236,984 $ 326,096