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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial Assets:
Fair Value	$ 4,997,688	$ 4,741,625
Recurring
Financial Assets:
Total assets at fair value	4,997,688	4,741,625
Recurring | U.S. Treasury securities
Financial Assets:
Fair Value	879,185	556,438
Recurring | U.S. agency securities
Financial Assets:
Fair Value	7,180	49,058
Recurring | U.S. agency mortgage-backed securities
Financial Assets:
Fair Value	750,938	783,743
Recurring | Municipal debt securities
Financial Assets:
Fair Value	562,510	602,690
Recurring | Non-U.S. government securities:
Financial Assets:
Fair Value	48,571	62,399
Recurring | Corporate debt securities
Financial Assets:
Fair Value	1,280,433	1,414,321
Recurring | Residential and commercial mortgage securities
Financial Assets:
Fair Value	493,693	511,824
Recurring | Asset-backed securities
Financial Assets:
Fair Value	614,818	624,561
Recurring | Money market funds
Financial Assets:
Fair Value	360,360	136,591
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1)
Financial Assets:
Total assets at fair value	1,239,545	693,029
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1) | U.S. Treasury securities
Financial Assets:
Fair Value	879,185	556,438
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1) | U.S. agency securities
Financial Assets:
Fair Value	0	0
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1) | U.S. agency mortgage-backed securities
Financial Assets:
Fair Value	0	0
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1) | Municipal debt securities
Financial Assets:
Fair Value	0	0
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1) | Non-U.S. government securities:
Financial Assets:
Fair Value	0	0
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1) | Corporate debt securities
Financial Assets:
Fair Value	0	0
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1) | Residential and commercial mortgage securities
Financial Assets:
Fair Value	0	0
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1) | Asset-backed securities
Financial Assets:
Fair Value	0	0
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1) | Money market funds
Financial Assets:
Fair Value	360,360	136,591
Recurring | Significant Other Observable Inputs (Level 2)
Financial Assets:
Total assets at fair value	3,758,143	4,048,596
Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities
Financial Assets:
Fair Value	0	0
Recurring | Significant Other Observable Inputs (Level 2) | U.S. agency securities
Financial Assets:
Fair Value	7,180	49,058
Recurring | Significant Other Observable Inputs (Level 2) | U.S. agency mortgage-backed securities
Financial Assets:
Fair Value	750,938	783,743
Recurring | Significant Other Observable Inputs (Level 2) | Municipal debt securities
Financial Assets:
Fair Value	562,510	602,690
Recurring | Significant Other Observable Inputs (Level 2) | Non-U.S. government securities:
Financial Assets:
Fair Value	48,571	62,399
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities
Financial Assets:
Fair Value	1,280,433	1,414,321
Recurring | Significant Other Observable Inputs (Level 2) | Residential and commercial mortgage securities
Financial Assets:
Fair Value	493,693	511,824
Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Financial Assets:
Fair Value	614,818	624,561
Recurring | Significant Other Observable Inputs (Level 2) | Money market funds
Financial Assets:
Fair Value	0	0
Recurring | Significant Unobservable Inputs (Level 3)
Financial Assets:
Total assets at fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury securities
Financial Assets:
Fair Value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. agency securities
Financial Assets:
Fair Value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. agency mortgage-backed securities
Financial Assets:
Fair Value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Municipal debt securities
Financial Assets:
Fair Value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Non-U.S. government securities:
Financial Assets:
Fair Value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities
Financial Assets:
Fair Value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Residential and commercial mortgage securities
Financial Assets:
Fair Value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Asset-backed securities
Financial Assets:
Fair Value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Money market funds
Financial Assets:
Fair Value	$ 0	$ 0

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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