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Investments - Schedule of Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Investments available for sale
Amortized Cost	$ 6,219,151	$ 6,231,018
Unrealized Gains	17,592	4,155
Unrealized Losses	(270,206)	(358,452)
Fair Value	5,966,537	5,876,721
U.S. Treasury securities
Investments available for sale
Amortized Cost	398,591	561,853
Unrealized Gains	1,707	325
Unrealized Losses	(8,837)	(14,888)
Fair Value	391,461	547,290
U.S. agency mortgage-backed securities
Investments available for sale
Amortized Cost	1,265,904	1,249,259
Unrealized Gains	2,646	42
Unrealized Losses	(95,835)	(123,865)
Fair Value	1,172,715	1,125,436
Municipal debt securities
Investments available for sale
Amortized Cost	645,877	631,015
Unrealized Gains	1,734	1,596
Unrealized Losses	(46,993)	(49,110)
Fair Value	600,618	583,501
Non-U.S. government securities
Investments available for sale
Amortized Cost	72,261	81,631
Unrealized Gains	0	0
Unrealized Losses	(10,095)	(11,833)
Fair Value	62,166	69,798
Corporate debt securities
Investments available for sale
Amortized Cost	1,968,972	1,887,647
Unrealized Gains	8,497	1,064
Unrealized Losses	(69,302)	(105,665)
Fair Value	1,908,167	1,783,046
Residential and commercial mortgage securities
Investments available for sale
Amortized Cost	484,715	519,613
Unrealized Gains	646	527
Unrealized Losses	(30,980)	(42,054)
Fair Value	454,381	478,086
Asset-backed securities
Investments available for sale
Amortized Cost	801,867	642,395
Unrealized Gains	2,362	601
Unrealized Losses	(8,164)	(11,037)
Fair Value	796,065	631,959
Money market funds
Investments available for sale
Amortized Cost	580,964	657,605
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	$ 580,964	$ 657,605

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