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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financial Assets:
Fair Value	$ 4,620,340	$ 4,962,887
Recurring
Financial Assets:
Total assets at fair value	4,620,340	4,962,887
Recurring | U.S. Treasury securities
Financial Assets:
Fair Value	470,146	448,793
Recurring | U.S. agency securities
Financial Assets:
Fair Value	2,000	5,504
Recurring | U.S. agency mortgage-backed securities
Financial Assets:
Fair Value	783,438	1,008,863
Recurring | Municipal debt securities
Financial Assets:
Fair Value	540,772	627,599
Recurring | Non-U.S. government securities:
Financial Assets:
Fair Value	65,135	79,743
Recurring | Corporate debt securities
Financial Assets:
Fair Value	1,354,110	1,455,247
Recurring | Residential and commercial mortgage securities
Financial Assets:
Fair Value	545,999	545,423
Recurring | Asset-backed securities
Financial Assets:
Fair Value	618,115	581,703
Recurring | Money market funds
Financial Assets:
Fair Value	240,625	210,012
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1)
Financial Assets:
Total assets at fair value	710,771	658,805
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1) | U.S. Treasury securities
Financial Assets:
Fair Value	470,146	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	240,625	210,012
Recurring | Significant Other Observable Inputs (Level 2)
Financial Assets:
Total assets at fair value	3,909,569	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	2,000	5,504
Recurring | Significant Other Observable Inputs (Level 2) | U.S. agency mortgage-backed securities
Financial Assets:
Fair Value	783,438	1,008,863
Recurring | Significant Other Observable Inputs (Level 2) | Municipal debt securities
Financial Assets:
Fair Value	540,772	627,599
Recurring | Significant Other Observable Inputs (Level 2) | Non-U.S. government securities:
Financial Assets:
Fair Value	65,135	79,743
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities
Financial Assets:
Fair Value	1,354,110	1,455,247
Recurring | Significant Other Observable Inputs (Level 2) | Residential and commercial mortgage securities
Financial Assets:
Fair Value	545,999	545,423
Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Financial Assets:
Fair Value	618,115	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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