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Investments - Schedule of Available For Sale Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Amortized Cost	$ 5,184,856	$ 4,897,607
Fair Value
Fair Value	4,741,625	4,962,887
U.S. Treasury securities
Amortized Cost
Due in 1 year	175,645
Due after 1 but within 5 years	355,565
Due after 5 but within 10 years	38,584
Due after 10 years	14,379
Subtotal	584,173
Amortized Cost	584,173	447,926
Fair Value
Due in 1 year	173,828
Due after 1 but within 5 years	335,166
Due after 5 but within 10 years	33,967
Due after 10 years	13,477
Subtotal	556,438
Fair Value	556,438	448,793
U.S. agency securities
Amortized Cost
Due in 1 year	47,433
Due after 1 but within 5 years	1,626
Subtotal	49,059
Amortized Cost	49,059	5,501
Fair Value
Due in 1 year	47,434
Due after 1 but within 5 years	1,624
Subtotal	49,058
Fair Value	49,058	5,504
Municipal debt securities
Amortized Cost
Due in 1 year	6,974
Due after 1 but within 5 years	151,110
Due after 5 but within 10 years	154,029
Due after 10 years	349,821
Subtotal	661,934
Amortized Cost	661,934	598,764
Fair Value
Due in 1 year	6,932
Due after 1 but within 5 years	148,538
Due after 5 but within 10 years	143,560
Due after 10 years	303,660
Subtotal	602,690
Fair Value	602,690	627,599
Non-U.S. government securities
Amortized Cost
Due in 1 year	10,021
Due after 1 but within 5 years	33,761
Due after 5 but within 10 years	5,532
Due after 10 years	20,337
Subtotal	69,651
Amortized Cost	69,651	77,366
Fair Value
Due in 1 year	9,979
Due after 1 but within 5 years	32,536
Due after 5 but within 10 years	4,397
Due after 10 years	15,487
Subtotal	62,399
Fair Value	62,399	79,743
Corporate debt securities
Amortized Cost
Due in 1 year	250,596
Due after 1 but within 5 years	715,711
Due after 5 but within 10 years	419,632
Due after 10 years	160,574
Subtotal	1,546,513
Amortized Cost	1,546,513	1,428,645
Fair Value
Due in 1 year	248,482
Due after 1 but within 5 years	684,102
Due after 5 but within 10 years	355,500
Due after 10 years	126,237
Subtotal	1,414,321
Fair Value	1,414,321	1,455,247
U.S. agency mortgage-backed securities
Amortized Cost
Amortized Cost	898,675	1,005,611
Fair Value
Fair Value	783,743	1,008,863
Residential and commercial mortgage securities
Amortized Cost
Amortized Cost	577,915	541,638
Fair Value
Fair Value	511,824	545,423
Asset-backed securities
Amortized Cost
Amortized Cost	660,345	582,144
Fair Value
Fair Value	624,561	581,703
Money market funds
Amortized Cost
Amortized Cost	136,591	210,012
Fair Value
Fair Value	$ 136,591	$ 210,012

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Section 50
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