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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 |

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