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Investments - Schedule of Amortized Cost and Fair Value of Investments Available for Sale by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Amortized Cost    
Amortized Cost $ 5,075,982 $ 4,897,607
Fair Value    
Fair Value 4,584,844 4,962,887
U.S. Treasury securities    
Amortized Cost    
Due in 1 year 169,120  
Due after 1 but within 5 years 353,483  
Due after 5 but within 10 years 38,835  
Due after 10 years 5,028  
Subtotal 566,466  
Amortized Cost 566,466 447,926
Fair Value    
Due in 1 year 167,667  
Due after 1 but within 5 years 330,053  
Due after 5 but within 10 years 34,103  
Due after 10 years 3,813  
Subtotal 535,636  
U.S. agency securities    
Amortized Cost    
Due in 1 year 0  
Due after 1 but within 5 years 0  
Subtotal 0  
Amortized Cost 0 5,501
Fair Value    
Due in 1 year 0  
Due after 1 but within 5 years 0  
Subtotal 0  
Municipal debt securities    
Amortized Cost    
Due in 1 year 6,992  
Due after 1 but within 5 years 141,922  
Due after 5 but within 10 years 164,538  
Due after 10 years 314,320  
Subtotal 627,772  
Amortized Cost 627,772 598,764
Fair Value    
Due in 1 year 6,943  
Due after 1 but within 5 years 137,108  
Due after 5 but within 10 years 151,508  
Due after 10 years 264,225  
Subtotal 559,784  
Non-U.S. government securities:    
Amortized Cost    
Due in 1 year 10,452  
Due after 1 but within 5 years 27,362  
Due after 5 but within 10 years 8,893  
Due after 10 years 23,419  
Subtotal 70,126  
Amortized Cost 70,126 77,366
Fair Value    
Due in 1 year 10,396  
Due after 1 but within 5 years 25,697  
Due after 5 but within 10 years 7,979  
Due after 10 years 16,762  
Subtotal 60,834  
Corporate debt securities    
Amortized Cost    
Due in 1 year 235,975  
Due after 1 but within 5 years 696,023  
Due after 5 but within 10 years 419,294  
Due after 10 years 149,858  
Subtotal 1,501,150  
Amortized Cost 1,501,150 1,428,645
Fair Value    
Due in 1 year 233,177  
Due after 1 but within 5 years 657,186  
Due after 5 but within 10 years 345,569  
Due after 10 years 109,337  
Subtotal 1,345,269  
U.S. agency mortgage-backed securities    
Amortized Cost    
Without single maturity date 879,028  
Amortized Cost 879,028 1,005,611
Fair Value    
Without single maturity date 752,236  
Residential and commercial mortgage securities    
Amortized Cost    
Without single maturity date 586,771  
Amortized Cost 586,771 541,638
Fair Value    
Without single maturity date 523,608  
Asset-backed securities    
Amortized Cost    
Without single maturity date 645,522  
Amortized Cost 645,522 582,144
Fair Value    
Without single maturity date 608,330  
Money market funds    
Amortized Cost    
Without single maturity date 199,147  
Amortized Cost 199,147 $ 210,012
Fair Value    
Without single maturity date $ 199,147