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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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