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Investments - Schedule of Investments Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Investments available for sale
Amortized Cost	$ 5,502,929	$ 5,184,856
Unrealized Gains	604	4,273
Unrealized Losses	(505,845)	(447,504)
Fair Value	4,997,688	4,741,625
U.S. Treasury securities
Investments available for sale
Amortized Cost	909,138	584,173
Unrealized Gains	24	341
Unrealized Losses	(29,977)	(28,076)
Fair Value	879,185	556,438
U.S. agency securities
Investments available for sale
Amortized Cost	7,198	49,059
Unrealized Gains	0	7
Unrealized Losses	(18)	(8)
Fair Value	7,180	49,058
U.S. agency mortgage-backed securities
Investments available for sale
Amortized Cost	898,677	898,675
Unrealized Gains	0	258
Unrealized Losses	(147,739)	(115,190)
Fair Value	750,938	783,743
Municipal debt securities
Investments available for sale
Amortized Cost	637,536	661,934
Unrealized Gains	64	2,010
Unrealized Losses	(75,090)	(61,254)
Fair Value	562,510	602,690
Non-U.S. government securities
Investments available for sale
Amortized Cost	57,407	69,651
Unrealized Gains	0	0
Unrealized Losses	(8,836)	(7,252)
Fair Value	48,571	62,399
Corporate debt securities
Investments available for sale
Amortized Cost	1,428,873	1,546,513
Unrealized Gains	144	1,195
Unrealized Losses	(148,584)	(133,387)
Fair Value	1,280,433	1,414,321
Residential and commercial mortgage securities
Investments available for sale
Amortized Cost	563,358	577,915
Unrealized Gains	218	390
Unrealized Losses	(69,883)	(66,481)
Fair Value	493,693	511,824
Asset-backed securities
Investments available for sale
Amortized Cost	640,382	660,345
Unrealized Gains	154	72
Unrealized Losses	(25,718)	(35,856)
Fair Value	614,818	624,561
Money market funds
Investments available for sale
Amortized Cost	360,360	136,591
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	$ 360,360	$ 136,591

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- Definition

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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