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Investments - Schedule of Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 5,586,730 | $ 5,184,856
Unrealized Gains | 13,446 | 4,273
Unrealized Losses | (336,437) | (447,504)
Fair Value | 5,263,739 | 4,741,625
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,014,076 | 584,173
Unrealized Gains | 1,434 | 341
Unrealized Losses | (19,128) | (28,076)
Fair Value | 996,382 | 556,438
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,199 | 49,059
Unrealized Gains | 0 | 7
Unrealized Losses | (4) | (8)
Fair Value | 7,195 | 49,058
U.S. agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 922,907 | 898,675
Unrealized Gains | 438 | 258
Unrealized Losses | (101,999) | (115,190)
Fair Value | 821,346 | 783,743
Municipal debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 585,047 | 661,934
Unrealized Gains | 6,660 | 2,010
Unrealized Losses | (44,449) | (61,254)
Fair Value | 547,258 | 602,690
Non-U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 77,516 | 69,651
Unrealized Gains | 0 | 0
Unrealized Losses | (10,069) | (7,252)
Fair Value | 67,447 | 62,399
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,380,533 | 1,546,513
Unrealized Gains | 4,425 | 1,195
Unrealized Losses | (87,903) | (133,387)
Fair Value | 1,297,055 | 1,414,321
Residential and commercial mortgage securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 571,163 | 577,915
Unrealized Gains | 286 | 390
Unrealized Losses | (53,509) | (66,481)
Fair Value | 517,940 | 511,824
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 584,168 | 660,345
Unrealized Gains | 203 | 72
Unrealized Losses | (19,376) | (35,856)
Fair Value | 564,995 | 624,561
Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 444,121 | 136,591
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | $ 444,121 | $ 136,591

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