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Investments - Schedule of Available For Sale Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 5,586,730 | $ 5,184,856
Fair Value |  |
Fair Value | 5,263,739 | 4,741,625
U.S. Treasury securities |  |
Amortized Cost |  |
Due in 1 year | 646,598 |
Due after 1 but within 5 years | 313,901 |
Due after 5 but within 10 years | 39,156 |
Due after 10 years | 14,421 |
Subtotal | 1,014,076 |
Amortized Cost | 1,014,076 | 584,173
Fair Value |  |
Due in 1 year | 645,280 |
Due after 1 but within 5 years | 301,424 |
Due after 5 but within 10 years | 36,194 |
Due after 10 years | 13,484 |
Subtotal | 996,382 |
Fair Value | 996,382 | 556,438
U.S. agency securities |  |
Amortized Cost |  |
Due in 1 year | 7,199 |
Due after 1 but within 5 years | 0 |
Subtotal | 7,199 |
Amortized Cost | 7,199 | 49,059
Fair Value |  |
Due in 1 year | 7,195 |
Due after 1 but within 5 years | 0 |
Subtotal | 7,195 |
Fair Value | 7,195 | 49,058
Municipal debt securities |  |
Amortized Cost |  |
Due in 1 year | 2,139 |
Due after 1 but within 5 years | 82,614 |
Due after 5 but within 10 years | 138,354 |
Due after 10 years | 361,940 |
Subtotal | 585,047 |
Amortized Cost | 585,047 | 661,934
Fair Value |  |
Due in 1 year | 2,121 |
Due after 1 but within 5 years | 80,349 |
Due after 5 but within 10 years | 130,186 |
Due after 10 years | 334,602 |
Subtotal | 547,258 |
Fair Value | 547,258 | 602,690
Non-U.S. government securities |  |
Amortized Cost |  |
Due in 1 year | 0 |
Due after 1 but within 5 years | 36,715 |
Due after 5 but within 10 years | 5,530 |
Due after 10 years | 35,271 |
Subtotal | 77,516 |
Amortized Cost | 77,516 | 69,651
Fair Value |  |
Due in 1 year | 0 |
Due after 1 but within 5 years | 35,362 |
Due after 5 but within 10 years | 4,520 |
Due after 10 years | 27,565 |
Subtotal | 67,447 |
Fair Value | 67,447 | 62,399
Corporate debt securities |  |
Amortized Cost |  |
Due in 1 year | 176,918 |
Due after 1 but within 5 years | 472,817 |
Due after 5 but within 10 years | 581,238 |
Due after 10 years | 149,560 |
Subtotal | 1,380,533 |
Amortized Cost | 1,380,533 | 1,546,513
Fair Value |  |
Due in 1 year | 175,145 |
Due after 1 but within 5 years | 453,496 |
Due after 5 but within 10 years | 543,115 |
Due after 10 years | 125,299 |
Subtotal | 1,297,055 |
Fair Value | 1,297,055 | 1,414,321
U.S. agency mortgage-backed securities |  |
Amortized Cost |  |
Amortized Cost | 922,907 | 898,675
Fair Value |  |
Fair Value | 821,346 | 783,743
Residential and commercial mortgage securities |  |
Amortized Cost |  |
Amortized Cost | 571,163 | 577,915
Fair Value |  |
Fair Value | 517,940 | 511,824
Asset-backed securities |  |
Amortized Cost |  |
Amortized Cost | 584,168 | 660,345
Fair Value |  |
Fair Value | 564,995 | 624,561
Money market funds |  |
Amortized Cost |  |
Amortized Cost | 444,121 | 136,591
Fair Value |  |
Fair Value | $ 444,121 | $ 136,591

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