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Investments - Schedule of Investments Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Investments available for sale
Amortized Cost	$ 5,438,287	$ 5,184,856
Unrealized Gains	6,560	4,273
Unrealized Losses	(422,753)	(447,504)
Fair Value	5,022,094	4,741,625
U.S. Treasury securities
Investments available for sale
Amortized Cost	670,537	584,173
Unrealized Gains	503	341
Unrealized Losses	(27,454)	(28,076)
Fair Value	643,586	556,438
U.S. agency securities
Investments available for sale
Amortized Cost	9,698	49,059
Unrealized Gains	0	7
Unrealized Losses	(27)	(8)
Fair Value	9,671	49,058
U.S. agency mortgage-backed securities
Investments available for sale
Amortized Cost	923,927	898,675
Unrealized Gains	347	258
Unrealized Losses	(114,166)	(115,190)
Fair Value	810,108	783,743
Municipal debt securities
Investments available for sale
Amortized Cost	646,058	661,934
Unrealized Gains	4,025	2,010
Unrealized Losses	(49,921)	(61,254)
Fair Value	600,162	602,690
Non-U.S. government securities
Investments available for sale
Amortized Cost	57,445	69,651
Unrealized Gains	0	0
Unrealized Losses	(6,892)	(7,252)
Fair Value	50,553	62,399
Corporate debt securities
Investments available for sale
Amortized Cost	1,473,003	1,546,513
Unrealized Gains	1,420	1,195
Unrealized Losses	(125,202)	(133,387)
Fair Value	1,349,221	1,414,321
Residential and commercial mortgage securities
Investments available for sale
Amortized Cost	575,624	577,915
Unrealized Gains	147	390
Unrealized Losses	(65,421)	(66,481)
Fair Value	510,350	511,824
Asset-backed securities
Investments available for sale
Amortized Cost	668,462	660,345
Unrealized Gains	118	72
Unrealized Losses	(33,670)	(35,856)
Fair Value	634,910	624,561
Money market funds
Investments available for sale
Amortized Cost	413,533	136,591
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	$ 413,533	$ 136,591

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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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