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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Sep. 30, 2023 USD ($) Investment
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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)

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