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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financial Assets: |  |
Fair Value | $ 4,584,844 | $ 4,962,887
Recurring |  |
Financial Assets: |  |
Total assets at fair value | 4,584,844 | 4,962,887
Recurring | U.S. Treasury securities |  |
Financial Assets: |  |
Fair Value | 535,636 | 448,793
Recurring | U.S. agency securities |  |
Financial Assets: |  |
Fair Value | 0 | 5,504
Recurring | U.S. agency mortgage-backed securities |  |
Financial Assets: |  |
Fair Value | 752,236 | 1,008,863
Recurring | Municipal debt securities |  |
Financial Assets: |  |
Fair Value | 559,784 | 627,599
Recurring | Non-U.S. government securities: |  |
Financial Assets: |  |
Fair Value | 60,834 | 79,743
Recurring | Corporate debt securities |  |
Financial Assets: |  |
Fair Value | 1,345,269 | 1,455,247
Recurring | Residential and commercial mortgage securities |  |
Financial Assets: |  |
Fair Value | 523,608 | 545,423
Recurring | Asset-backed securities |  |
Financial Assets: |  |
Fair Value | 608,330 | 581,703
Recurring | Money market funds |  |
Financial Assets: |  |
Fair Value | 199,147 | 210,012
Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) |  |
Financial Assets: |  |
Total assets at fair value | 734,783 | 658,805
Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | U.S. Treasury securities |  |
Financial Assets: |  |
Fair Value | 535,636 | 448,793
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 | 199,147 | 210,012
Recurring | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Total assets at fair value | 3,850,061 | 4,304,082
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 | 0 | 5,504
Recurring | Significant Other Observable Inputs (Level 2) | U.S. agency mortgage-backed securities |  |
Financial Assets: |  |
Fair Value | 752,236 | 1,008,863
Recurring | Significant Other Observable Inputs (Level 2) | Municipal debt securities |  |
Financial Assets: |  |
Fair Value | 559,784 | 627,599
Recurring | Significant Other Observable Inputs (Level 2) | Non-U.S. government securities: |  |
Financial Assets: |  |
Fair Value | 60,834 | 79,743
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Financial Assets: |  |
Fair Value | 1,345,269 | 1,455,247
Recurring | Significant Other Observable Inputs (Level 2) | Residential and commercial mortgage securities |  |
Financial Assets: |  |
Fair Value | 523,608 | 545,423
Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Financial Assets: |  |
Fair Value | 608,330 | 581,703
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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