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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financial Assets:
Fair Value	$ 4,662,905	$ 4,962,887
Recurring
Financial Assets:
Total assets at fair value	4,662,905	4,962,887
Recurring | U.S. Treasury securities
Financial Assets:
Fair Value	423,640	448,793
Recurring | U.S. agency securities
Financial Assets:
Fair Value		5,504
Recurring | U.S. agency mortgage-backed securities
Financial Assets:
Fair Value	854,775	1,008,863
Recurring | Municipal debt securities
Financial Assets:
Fair Value	512,185	627,599
Recurring | Non-U.S. government securities:
Financial Assets:
Fair Value	71,743	79,743
Recurring | Corporate debt securities
Financial Assets:
Fair Value	1,283,644	1,455,247
Recurring | Residential and commercial mortgage securities
Financial Assets:
Fair Value	538,870	545,423
Recurring | Asset-backed securities
Financial Assets:
Fair Value	594,451	581,703
Recurring | Money market funds
Financial Assets:
Fair Value	383,597	210,012
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1)
Financial Assets:
Total assets at fair value	807,237	658,805
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1) | U.S. Treasury securities
Financial Assets:
Fair Value	423,640	448,793
Recurring | Quoted Prices in Active  Markets for Identical Instruments (Level 1) | U.S. agency securities
Financial Assets:
Fair Value		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	383,597	210,012
Recurring | Significant Other Observable Inputs (Level 2)
Financial Assets:
Total assets at fair value	3,855,668	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		5,504
Recurring | Significant Other Observable Inputs (Level 2) | U.S. agency mortgage-backed securities
Financial Assets:
Fair Value	854,775	1,008,863
Recurring | Significant Other Observable Inputs (Level 2) | Municipal debt securities
Financial Assets:
Fair Value	512,185	627,599
Recurring | Significant Other Observable Inputs (Level 2) | Non-U.S. government securities:
Financial Assets:
Fair Value	71,743	79,743
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities
Financial Assets:
Fair Value	1,283,644	1,455,247
Recurring | Significant Other Observable Inputs (Level 2) | Residential and commercial mortgage securities
Financial Assets:
Fair Value	538,870	545,423
Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Financial Assets:
Fair Value	594,451	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
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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