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v3.25.1

Investments - Schedule of Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Investments available for sale |  |
Amortized Cost | $ 6,153,624 | $ 6,231,018
Unrealized Gains | 11,121 | 4,155
Unrealized Losses | (282,386) | (358,452)
Fair Value | 5,882,359 | 5,876,721
U.S. Treasury securities |  |
Investments available for sale |  |
Amortized Cost | 554,597 | 561,853
Unrealized Gains | 1,068 | 325
Unrealized Losses | (10,403) | (14,888)
Fair Value | 545,262 | 547,290
U.S. agency mortgage-backed securities |  |
Investments available for sale |  |
Amortized Cost | 1,254,479 | 1,249,259
Unrealized Gains | 2,577 | 42
Unrealized Losses | (91,413) | (123,865)
Fair Value | 1,165,643 | 1,125,436
Municipal debt securities |  |
Investments available for sale |  |
Amortized Cost | 634,161 | 631,015
Unrealized Gains | 1,606 | 1,596
Unrealized Losses | (43,206) | (49,110)
Fair Value | 592,561 | 583,501
Non-U.S. government securities |  |
Investments available for sale |  |
Amortized Cost | 72,338 | 81,631
Unrealized Gains | 0 | 0
Unrealized Losses | (10,468) | (11,833)
Fair Value | 61,870 | 69,798
Corporate debt securities |  |
Investments available for sale |  |
Amortized Cost | 1,945,158 | 1,887,647
Unrealized Gains | 3,812 | 1,064
Unrealized Losses | (81,479) | (105,665)
Fair Value | 1,867,491 | 1,783,046
Residential and commercial mortgage securities |  |
Investments available for sale |  |
Amortized Cost | 505,931 | 519,613
Unrealized Gains | 498 | 527
Unrealized Losses | (35,948) | (42,054)
Fair Value | 470,481 | 478,086
Asset-backed securities |  |
Investments available for sale |  |
Amortized Cost | 754,428 | 642,395
Unrealized Gains | 1,560 | 601
Unrealized Losses | (9,469) | (11,037)
Fair Value | 746,519 | 631,959
Money market funds |  |
Investments available for sale |  |
Amortized Cost | 432,532 | 657,605
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | $ 432,532 | $ 657,605

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