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Investments - Amortized Cost and Fair Values of Debt Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Amortized cost    
Due in one year or less $ 650,211  
Due after one year through five years 1,697,951  
Due after five years through ten years 1,626,253  
Due after ten years 905,636  
Total debt securities with single maturity date, amortized cost 4,880,051  
Amortized Cost 5,897,961 $ 5,944,001
Fair Value    
Due in one year or less 649,526  
Due after one year through five years 1,662,497  
Due after five years through ten years 1,565,298  
Due after ten years 822,311  
Total debt securities with single maturity date, fair value 4,699,632  
Total at end of period 5,703,121 5,791,231
ABS    
Amortized cost    
Total debt securities without single maturity date, amortized cost 263,392  
Amortized Cost 263,392 225,478
Fair Value    
Total debt securities without single maturity date, fair value 262,641  
Total at end of period 262,641 226,561
RMBS    
Amortized cost    
Total debt securities without single maturity date, amortized cost 361,981  
Amortized Cost 361,981 366,671
Fair Value    
Total debt securities without single maturity date, fair value 350,710  
Total at end of period 350,710 358,024
CMBS    
Amortized cost    
Total debt securities without single maturity date, amortized cost 261,115  
Amortized Cost 261,115 237,974
Fair Value    
Total debt securities without single maturity date, fair value 258,917  
Total at end of period 258,917 238,783
CLOs    
Amortized cost    
Total debt securities without single maturity date, amortized cost 131,422  
Amortized Cost 131,422 99,182
Fair Value    
Total debt securities without single maturity date, fair value 131,221  
Total at end of period $ 131,221 $ 99,287