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Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Vale on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Financial Assets:
Fair Value	$ 5,966,537	$ 5,876,721
Recurring
Financial Assets:
Total assets at fair value	5,966,537	5,876,721
Recurring | U.S. Treasury securities
Financial Assets:
Fair Value	391,461	547,290
Recurring | U.S. agency mortgage-backed securities
Financial Assets:
Fair Value	1,172,715	1,125,436
Recurring | Municipal debt securities
Financial Assets:
Fair Value	600,618	583,501
Recurring | Non-U.S. government securities
Financial Assets:
Fair Value	62,166	69,798
Recurring | Corporate debt securities:
Financial Assets:
Fair Value	1,908,167	1,783,046
Recurring | Residential and commercial mortgage securities
Financial Assets:
Fair Value	454,381	478,086
Recurring | Asset-backed securities
Financial Assets:
Fair Value	796,065	631,959
Recurring | Money market funds
Financial Assets:
Fair Value	580,964	657,605
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1)
Financial Assets:
Total assets at fair value	972,425	1,204,895
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1) | U.S. Treasury securities
Financial Assets:
Fair Value	391,461	547,290
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	580,964	657,605
Recurring | Significant Other Observable Inputs (Level 2)
Financial Assets:
Total assets at fair value	4,994,112	4,671,826
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 mortgage-backed securities
Financial Assets:
Fair Value	1,172,715	1,125,436
Recurring | Significant Other Observable Inputs (Level 2) | Municipal debt securities
Financial Assets:
Fair Value	600,618	583,501
Recurring | Significant Other Observable Inputs (Level 2) | Non-U.S. government securities
Financial Assets:
Fair Value	62,166	69,798
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities:
Financial Assets:
Fair Value	1,908,167	1,783,046
Recurring | Significant Other Observable Inputs (Level 2) | Residential and commercial mortgage securities
Financial Assets:
Fair Value	454,381	478,086
Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Financial Assets:
Fair Value	796,065	631,959
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 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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