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Investments, Investments Temporarily Impaired (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Investment
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 621
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 1,331,636
More than 12 months of temporary impairment 470,211
Total temporary impairment 1,801,847
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (7,125)
More than 12 months of temporary impairment (9,147)
Total temporary impairment $ (16,272)
Corporate Debt Securities [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 370
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 469,095
More than 12 months of temporary impairment 207,073
Total temporary impairment 676,168
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (2,390)
More than 12 months of temporary impairment (5,262)
Total temporary impairment $ (7,652)
Debt Securities Issued by U.S. Government Agencies [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 98
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 293,408
More than 12 months of temporary impairment 24,531
Total temporary impairment 317,939
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (1,242)
More than 12 months of temporary impairment (694)
Total temporary impairment $ (1,936)
Debt Securities Issued by the U.S. Treasury [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 68
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 557,489
More than 12 months of temporary impairment 225,634
Total temporary impairment 783,123
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (3,420)
More than 12 months of temporary impairment (2,971)
Total temporary impairment $ (6,391)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]  
Temporarily Impaired Investments [Abstract]  
Number of investments | Investment 85
Estimated Fair Value [Abstract]  
Less than 12 months of temporary impairment $ 11,644
More than 12 months of temporary impairment 12,973
Total temporary impairment 24,617
Unrealized Losses [Abstract]  
Less than 12 months of temporary impairment (73)
More than 12 months of temporary impairment (220)
Total temporary impairment $ (293)