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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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