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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial Assets:
Fair Value	$ 5,369,074	$ 5,263,739
Recurring
Financial Assets:
Total assets at fair value	5,369,074	5,263,739
Recurring | U.S. Treasury securities
Financial Assets:
Fair Value	1,036,787	996,382
Recurring | U.S. agency securities
Financial Assets:
Fair Value	1,573	7,195
Recurring | U.S. agency mortgage-backed securities
Financial Assets:
Fair Value	787,285	821,346
Recurring | Municipal debt securities
Financial Assets:
Fair Value	539,678	547,258
Recurring | Non-U.S. government securities:
Financial Assets:
Fair Value	66,395	67,447
Recurring | Corporate debt securities
Financial Assets:
Fair Value	1,219,160	1,297,055
Recurring | Residential and commercial mortgage securities
Financial Assets:
Fair Value	506,780	517,940
Recurring | Asset-backed securities
Financial Assets:
Fair Value	522,352	564,995
Recurring | Money market funds
Financial Assets:
Fair Value	689,064	444,121
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1)
Financial Assets:
Total assets at fair value	1,725,851	1,440,503
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1) | U.S. Treasury securities
Financial Assets:
Fair Value	1,036,787	996,382
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	689,064	444,121
Recurring | Significant Other Observable Inputs (Level 2)
Financial Assets:
Total assets at fair value	3,643,223	3,823,236
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	1,573	7,195
Recurring | Significant Other Observable Inputs (Level 2) | U.S. agency mortgage-backed securities
Financial Assets:
Fair Value	787,285	821,346
Recurring | Significant Other Observable Inputs (Level 2) | Municipal debt securities
Financial Assets:
Fair Value	539,678	547,258
Recurring | Significant Other Observable Inputs (Level 2) | Non-U.S. government securities:
Financial Assets:
Fair Value	66,395	67,447
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities
Financial Assets:
Fair Value	1,219,160	1,297,055
Recurring | Significant Other Observable Inputs (Level 2) | Residential and commercial mortgage securities
Financial Assets:
Fair Value	506,780	517,940
Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Financial Assets:
Fair Value	522,352	564,995
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
-Topic 320
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