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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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