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Investments - Schedule of Amortized Cost and Fair Value of Investments Available for Sale by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost
Amortized Cost	$ 5,325,085	$ 5,184,856
Fair Value
Fair Value	4,950,036	4,741,625
U.S. Treasury securities
Amortized Cost
Due in 1 year	130,959
Due after 1 but within 5 years	313,584
Due after 5 but within 10 years	38,335
Due after 10 years	14,389
Subtotal	497,267
Amortized Cost	497,267	584,173
Fair Value
Due in 1 year	129,312
Due after 1 but within 5 years	297,672
Due after 5 but within 10 years	34,655
Due after 10 years	14,145
Subtotal	475,784
U.S. agency securities
Amortized Cost
Due in 1 year	11,125
Due after 1 but within 5 years	1,571
Subtotal	12,696
Amortized Cost	12,696	49,059
Fair Value
Due in 1 year	11,111
Due after 1 but within 5 years	1,579
Subtotal	12,690
Municipal debt securities
Amortized Cost
Due in 1 year	6,006
Due after 1 but within 5 years	88,888
Due after 5 but within 10 years	175,352
Due after 10 years	380,224
Subtotal	650,470
Amortized Cost	650,470	661,934
Fair Value
Due in 1 year	5,977
Due after 1 but within 5 years	86,924
Due after 5 but within 10 years	167,037
Due after 10 years	349,072
Subtotal	609,010
Non-U.S. government securities:
Amortized Cost
Due in 1 year	10,020
Due after 1 but within 5 years	33,759
Due after 5 but within 10 years	5,532
Due after 10 years	20,295
Subtotal	69,606
Amortized Cost	69,606	69,651
Fair Value
Due in 1 year	10,012
Due after 1 but within 5 years	32,824
Due after 5 but within 10 years	4,512
Due after 10 years	15,670
Subtotal	63,018
Corporate debt securities
Amortized Cost
Due in 1 year	241,103
Due after 1 but within 5 years	635,267
Due after 5 but within 10 years	484,388
Due after 10 years	214,885
Subtotal	1,575,643
Amortized Cost	1,575,643	1,546,513
Fair Value
Due in 1 year	238,178
Due after 1 but within 5 years	605,227
Due after 5 but within 10 years	433,797
Due after 10 years	185,394
Subtotal	1,462,596
U.S. agency mortgage-backed securities
Amortized Cost
Without single maturity date	950,645
Amortized Cost	950,645	898,675
Fair Value
Without single maturity date	850,124
Residential and commercial mortgage securities
Amortized Cost
Without single maturity date	601,606
Amortized Cost	601,606	577,915
Fair Value
Without single maturity date	542,013
Asset-backed securities
Amortized Cost
Without single maturity date	680,460
Amortized Cost	680,460	660,345
Fair Value
Without single maturity date	648,109
Money market funds
Amortized Cost
Without single maturity date	286,692
Amortized Cost	286,692	$ 136,591
Fair Value
Without single maturity date	$ 286,692

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