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Investments - Schedule of Available For Sale Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 5,809,829 | $ 5,586,730
Fair Value |  |
Fair Value | 5,454,983 | 5,263,739
U.S. Treasury securities |  |
Amortized Cost |  |
Due in 1 year | 669,532 |
Due after 1 but within 5 years | 296,652 |
Due after 5 but within 10 years | 38,816 |
Due after 10 years | 14,443 |
Subtotal | 1,019,443 |
Amortized Cost | 1,019,443 | 1,014,076
Fair Value |  |
Due in 1 year | 666,822 |
Due after 1 but within 5 years | 284,595 |
Due after 5 but within 10 years | 35,074 |
Due after 10 years | 12,685 |
Subtotal | 999,176 |
Fair Value | 999,176 | 996,382
Municipal debt securities |  |
Amortized Cost |  |
Due in 1 year | 10,148 |
Due after 1 but within 5 years | 86,662 |
Due after 5 but within 10 years | 125,670 |
Due after 10 years | 345,889 |
Subtotal | 568,369 |
Amortized Cost | 568,369 | 585,047
Fair Value |  |
Due in 1 year | 9,992 |
Due after 1 but within 5 years | 83,246 |
Due after 5 but within 10 years | 116,787 |
Due after 10 years | 314,371 |
Subtotal | 524,396 |
Fair Value | 524,396 | 547,258
Non-U.S. government securities: |  |
Amortized Cost |  |
Due in 1 year | 4,800 |
Due after 1 but within 5 years | 31,896 |
Due after 5 but within 10 years | 8,338 |
Due after 10 years | 32,336 |
Subtotal | 77,370 |
Amortized Cost | 77,370 | 77,516
Fair Value |  |
Due in 1 year | 4,715 |
Due after 1 but within 5 years | 30,319 |
Due after 5 but within 10 years | 6,856 |
Due after 10 years | 24,141 |
Subtotal | 66,031 |
Fair Value | 66,031 | 67,447
Corporate debt securities: |  |
Amortized Cost |  |
Due in 1 year | 160,824 |
Due after 1 but within 5 years | 405,414 |
Due after 5 but within 10 years | 536,015 |
Due after 10 years | 146,035 |
Subtotal | 1,248,288 |
Amortized Cost | 1,248,288 | 1,380,533
Fair Value |  |
Due in 1 year | 159,044 |
Due after 1 but within 5 years | 384,152 |
Due after 5 but within 10 years | 491,049 |
Due after 10 years | 117,731 |
Subtotal | 1,151,976 |
Fair Value | 1,151,976 | 1,297,055
U.S. agency mortgage-backed securities |  |
Amortized Cost |  |
Amortized Cost | 876,049 | 922,907
Fair Value |  |
Fair Value | 757,590 | 821,346
Residential and commercial mortgage securities |  |
Amortized Cost |  |
Amortized Cost | 550,708 | 571,163
Fair Value |  |
Fair Value | 498,987 | 517,940
Asset-backed securities |  |
Amortized Cost |  |
Amortized Cost | 468,228 | 584,168
Fair Value |  |
Fair Value | 455,453 | 564,995
Money market funds |  |
Amortized Cost |  |
Amortized Cost | 1,001,374 | 444,121
Fair Value |  |
Fair Value | $ 1,001,374 | $ 444,121

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