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Investments - Schedule of Amortized Cost and Fair Value of Investments Available for Sale by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Amortized Cost    
Amortized Cost $ 5,438,287 $ 5,184,856
Fair Value    
Fair Value 5,022,094 4,741,625
U.S. Treasury securities    
Amortized Cost    
Due in 1 year 273,518  
Due after 1 but within 5 years 325,556  
Due after 5 but within 10 years 57,063  
Due after 10 years 14,400  
Subtotal 670,537  
Amortized Cost 670,537 584,173
Fair Value    
Due in 1 year 271,747  
Due after 1 but within 5 years 305,868  
Due after 5 but within 10 years 52,252  
Due after 10 years 13,719  
Subtotal 643,586  
U.S. agency securities    
Amortized Cost    
Due in 1 year 9,698  
Subtotal 9,698  
Amortized Cost 9,698 49,059
Fair Value    
Due in 1 year 9,671  
Subtotal 9,671  
Municipal debt securities    
Amortized Cost    
Due in 1 year 4,906  
Due after 1 but within 5 years 91,150  
Due after 5 but within 10 years 175,677  
Due after 10 years 374,325  
Subtotal 646,058  
Amortized Cost 646,058 661,934
Fair Value    
Due in 1 year 4,896  
Due after 1 but within 5 years 87,755  
Due after 5 but within 10 years 165,374  
Due after 10 years 342,137  
Subtotal 600,162  
Non-U.S. government securities:    
Amortized Cost    
Due after 1 but within 5 years 32,128  
Due after 5 but within 10 years 5,065  
Due after 10 years 20,252  
Subtotal 57,445  
Amortized Cost 57,445 69,651
Fair Value    
Due after 1 but within 5 years 30,877  
Due after 5 but within 10 years 4,114  
Due after 10 years 15,562  
Subtotal 50,553  
Corporate debt securities    
Amortized Cost    
Due in 1 year 197,737  
Due after 1 but within 5 years 584,412  
Due after 5 but within 10 years 476,475  
Due after 10 years 214,379  
Subtotal 1,473,003  
Amortized Cost 1,473,003 1,546,513
Fair Value    
Due in 1 year 194,606  
Due after 1 but within 5 years 550,847  
Due after 5 but within 10 years 421,678  
Due after 10 years 182,090  
Subtotal 1,349,221  
U.S. agency mortgage-backed securities    
Amortized Cost    
Without single maturity date 923,927  
Amortized Cost 923,927 898,675
Fair Value    
Without single maturity date 810,108  
Residential and commercial mortgage securities    
Amortized Cost    
Without single maturity date 575,624  
Amortized Cost 575,624 577,915
Fair Value    
Without single maturity date 510,350  
Asset-backed securities    
Amortized Cost    
Without single maturity date 668,462  
Amortized Cost 668,462 660,345
Fair Value    
Without single maturity date 634,910  
Money market funds    
Amortized Cost    
Without single maturity date 413,533  
Amortized Cost 413,533 $ 136,591
Fair Value    
Without single maturity date $ 413,533