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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, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 5,502,929 | $ 5,184,856
Fair Value |  |
Fair Value | 4,997,688 | 4,741,625
U.S. Treasury securities |  |
Amortized Cost |  |
Due in 1 year | 526,416 |
Due after 1 but within 5 years | 305,939 |
Due after 5 but within 10 years | 62,373 |
Due after 10 years | 14,410 |
Subtotal | 909,138 |
Amortized Cost | 909,138 | 584,173
Fair Value |  |
Due in 1 year | 524,639 |
Due after 1 but within 5 years | 286,589 |
Due after 5 but within 10 years | 55,799 |
Due after 10 years | 12,158 |
Subtotal | 879,185 |
U.S. agency securities |  |
Amortized Cost |  |
Due in 1 year | 7,198 |
Subtotal | 7,198 |
Amortized Cost | 7,198 | 49,059
Fair Value |  |
Due in 1 year | 7,180 |
Subtotal | 7,180 |
Municipal debt securities |  |
Amortized Cost |  |
Due in 1 year | 2,388 |
Due after 1 but within 5 years | 101,186 |
Due after 5 but within 10 years | 168,182 |
Due after 10 years | 365,780 |
Subtotal | 637,536 |
Amortized Cost | 637,536 | 661,934
Fair Value |  |
Due in 1 year | 2,347 |
Due after 1 but within 5 years | 96,172 |
Due after 5 but within 10 years | 153,099 |
Due after 10 years | 310,892 |
Subtotal | 562,510 |
Non-U.S. government securities: |  |
Amortized Cost |  |
Due after 1 but within 5 years | 32,135 |
Due after 5 but within 10 years | 5,064 |
Due after 10 years | 20,208 |
Subtotal | 57,407 |
Amortized Cost | 57,407 | 69,651
Fair Value |  |
Due after 1 but within 5 years | 30,496 |
Due after 5 but within 10 years | 3,945 |
Due after 10 years | 14,130 |
Subtotal | 48,571 |
Corporate debt securities |  |
Amortized Cost |  |
Due in 1 year | 194,084 |
Due after 1 but within 5 years | 569,356 |
Due after 5 but within 10 years | 483,787 |
Due after 10 years | 181,646 |
Subtotal | 1,428,873 |
Amortized Cost | 1,428,873 | 1,546,513
Fair Value |  |
Due in 1 year | 190,994 |
Due after 1 but within 5 years | 534,150 |
Due after 5 but within 10 years | 415,847 |
Due after 10 years | 139,442 |
Subtotal | 1,280,433 |
U.S. agency mortgage-backed securities |  |
Amortized Cost |  |
Without single maturity date | 898,677 |
Amortized Cost | 898,677 | 898,675
Fair Value |  |
Without single maturity date | 750,938 |
Residential and commercial mortgage securities |  |
Amortized Cost |  |
Without single maturity date | 563,358 |
Amortized Cost | 563,358 | 577,915
Fair Value |  |
Without single maturity date | 493,693 |
Asset-backed securities |  |
Amortized Cost |  |
Without single maturity date | 640,382 |
Amortized Cost | 640,382 | 660,345
Fair Value |  |
Without single maturity date | 614,818 |
Money market funds |  |
Amortized Cost |  |
Without single maturity date | 360,360 |
Amortized Cost | 360,360 | $ 136,591
Fair Value |  |
Without single maturity date | $ 360,360 |

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