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Investments - Schedule of Available For Sale Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 6,231,018 | $ 5,586,730
Fair Value |  |
Fair Value | 5,876,721 | 5,263,739
U.S. Treasury securities |  |
Amortized Cost |  |
Due in 1 year | 213,553 |
Due after 1 but within 5 years | 301,532 |
Due after 5 but within 10 years | 32,302 |
Due after 10 years | 14,466 |
Subtotal | 561,853 |
Amortized Cost | 561,853 | 1,014,076
Fair Value |  |
Due in 1 year | 212,961 |
Due after 1 but within 5 years | 292,711 |
Due after 5 but within 10 years | 29,303 |
Due after 10 years | 12,315 |
Subtotal | 547,290 |
Fair Value | 547,290 | 996,382
Municipal debt securities |  |
Amortized Cost |  |
Due in 1 year | 16,767 |
Due after 1 but within 5 years | 84,229 |
Due after 5 but within 10 years | 144,143 |
Due after 10 years | 385,876 |
Subtotal | 631,015 |
Amortized Cost | 631,015 | 585,047
Fair Value |  |
Due in 1 year | 16,624 |
Due after 1 but within 5 years | 81,905 |
Due after 5 but within 10 years | 134,741 |
Due after 10 years | 350,231 |
Subtotal | 583,501 |
Fair Value | 583,501 | 547,258
Non-U.S. government securities |  |
Amortized Cost |  |
Due in 1 year | 5,267 |
Due after 1 but within 5 years | 32,032 |
Due after 5 but within 10 years | 7,706 |
Due after 10 years | 36,626 |
Subtotal | 81,631 |
Amortized Cost | 81,631 | 77,516
Fair Value |  |
Due in 1 year | 5,233 |
Due after 1 but within 5 years | 30,792 |
Due after 5 but within 10 years | 6,195 |
Due after 10 years | 27,578 |
Subtotal | 69,798 |
Fair Value | 69,798 | 67,447
Corporate debt securities |  |
Amortized Cost |  |
Due in 1 year | 164,458 |
Due after 1 but within 5 years | 505,921 |
Due after 5 but within 10 years | 1,014,720 |
Due after 10 years | 202,548 |
Subtotal | 1,887,647 |
Amortized Cost | 1,887,647 | 1,380,533
Fair Value |  |
Due in 1 year | 163,676 |
Due after 1 but within 5 years | 489,307 |
Due after 5 but within 10 years | 959,079 |
Due after 10 years | 170,984 |
Subtotal | 1,783,046 |
Fair Value | 1,783,046 | 1,297,055
U.S. agency mortgage-backed securities |  |
Amortized Cost |  |
Amortized Cost | 1,249,259 | 922,907
Fair Value |  |
Fair Value | 1,125,436 | 821,346
Residential and commercial mortgage securities |  |
Amortized Cost |  |
Amortized Cost | 519,613 | 571,163
Fair Value |  |
Fair Value | 478,086 | 517,940
Asset-backed securities |  |
Amortized Cost |  |
Amortized Cost | 642,395 | 584,168
Fair Value |  |
Fair Value | 631,959 | 564,995
Money market funds |  |
Amortized Cost |  |
Amortized Cost | 657,605 | 444,121
Fair Value |  |
Fair Value | $ 657,605 | $ 444,121

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