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Investments - Schedule of Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Investments available for sale
Amortized Cost	$ 5,809,829	$ 5,586,730
Unrealized Gains	4,774	13,446
Unrealized Losses	(359,620)	(336,437)
Fair Value	5,454,983	5,263,739
U.S. Treasury securities
Investments available for sale
Amortized Cost	1,019,443	1,014,076
Unrealized Gains	106	1,434
Unrealized Losses	(20,373)	(19,128)
Fair Value	999,176	996,382
U.S. agency securities
Investments available for sale
Amortized Cost		7,199
Unrealized Gains		0
Unrealized Losses		(4)
Fair Value		7,195
U.S. agency mortgage-backed securities
Investments available for sale
Amortized Cost	876,049	922,907
Unrealized Gains	25	438
Unrealized Losses	(118,484)	(101,999)
Fair Value	757,590	821,346
Municipal debt securities
Investments available for sale
Amortized Cost	568,369	585,047
Unrealized Gains	2,951	6,660
Unrealized Losses	(46,924)	(44,449)
Fair Value	524,396	547,258
Non-U.S. government securities
Investments available for sale
Amortized Cost	77,370	77,516
Unrealized Gains	0	0
Unrealized Losses	(11,339)	(10,069)
Fair Value	66,031	67,447
Corporate debt securities:
Investments available for sale
Amortized Cost	1,248,288	1,380,533
Unrealized Gains	1,034	4,425
Unrealized Losses	(97,346)	(87,903)
Fair Value	1,151,976	1,297,055
Residential and commercial mortgage securities
Investments available for sale
Amortized Cost	550,708	571,163
Unrealized Gains	248	286
Unrealized Losses	(51,969)	(53,509)
Fair Value	498,987	517,940
Asset-backed securities
Investments available for sale
Amortized Cost	468,228	584,168
Unrealized Gains	410	203
Unrealized Losses	(13,185)	(19,376)
Fair Value	455,453	564,995
Money market funds
Investments available for sale
Amortized Cost	1,001,374	444,121
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	$ 1,001,374	$ 444,121

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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