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Investments - Schedule of Available For Sale Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 5,184,856 | $ 4,897,607
Fair Value |  |
Fair Value | 4,741,625 | 4,962,887
U.S. Treasury securities |  |
Amortized Cost |  |
Due in 1 year | 175,645 |
Due after 1 but within 5 years | 355,565 |
Due after 5 but within 10 years | 38,584 |
Due after 10 years | 14,379 |
Subtotal | 584,173 |
Amortized Cost | 584,173 | 447,926
Fair Value |  |
Due in 1 year | 173,828 |
Due after 1 but within 5 years | 335,166 |
Due after 5 but within 10 years | 33,967 |
Due after 10 years | 13,477 |
Subtotal | 556,438 |
Fair Value | 556,438 | 448,793
U.S. agency securities |  |
Amortized Cost |  |
Due in 1 year | 47,433 |
Due after 1 but within 5 years | 1,626 |
Subtotal | 49,059 |
Amortized Cost | 49,059 | 5,501
Fair Value |  |
Due in 1 year | 47,434 |
Due after 1 but within 5 years | 1,624 |
Subtotal | 49,058 |
Fair Value | 49,058 | 5,504
Municipal debt securities |  |
Amortized Cost |  |
Due in 1 year | 6,974 |
Due after 1 but within 5 years | 151,110 |
Due after 5 but within 10 years | 154,029 |
Due after 10 years | 349,821 |
Subtotal | 661,934 |
Amortized Cost | 661,934 | 598,764
Fair Value |  |
Due in 1 year | 6,932 |
Due after 1 but within 5 years | 148,538 |
Due after 5 but within 10 years | 143,560 |
Due after 10 years | 303,660 |
Subtotal | 602,690 |
Fair Value | 602,690 | 627,599
Non-U.S. government securities |  |
Amortized Cost |  |
Due in 1 year | 10,021 |
Due after 1 but within 5 years | 33,761 |
Due after 5 but within 10 years | 5,532 |
Due after 10 years | 20,337 |
Subtotal | 69,651 |
Amortized Cost | 69,651 | 77,366
Fair Value |  |
Due in 1 year | 9,979 |
Due after 1 but within 5 years | 32,536 |
Due after 5 but within 10 years | 4,397 |
Due after 10 years | 15,487 |
Subtotal | 62,399 |
Fair Value | 62,399 | 79,743
Corporate debt securities |  |
Amortized Cost |  |
Due in 1 year | 250,596 |
Due after 1 but within 5 years | 715,711 |
Due after 5 but within 10 years | 419,632 |
Due after 10 years | 160,574 |
Subtotal | 1,546,513 |
Amortized Cost | 1,546,513 | 1,428,645
Fair Value |  |
Due in 1 year | 248,482 |
Due after 1 but within 5 years | 684,102 |
Due after 5 but within 10 years | 355,500 |
Due after 10 years | 126,237 |
Subtotal | 1,414,321 |
Fair Value | 1,414,321 | 1,455,247
U.S. agency mortgage-backed securities |  |
Amortized Cost |  |
Amortized Cost | 898,675 | 1,005,611
Fair Value |  |
Fair Value | 783,743 | 1,008,863
Residential and commercial mortgage securities |  |
Amortized Cost |  |
Amortized Cost | 577,915 | 541,638
Fair Value |  |
Fair Value | 511,824 | 545,423
Asset-backed securities |  |
Amortized Cost |  |
Amortized Cost | 660,345 | 582,144
Fair Value |  |
Fair Value | 624,561 | 581,703
Money market funds |  |
Amortized Cost |  |
Amortized Cost | 136,591 | 210,012
Fair Value |  |
Fair Value | $ 136,591 | $ 210,012

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