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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Jun. 30, 2024 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 664
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 1,260,824
More than 12 months of temporary impairment | 331,607
Total temporary impairment | 1,592,431
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (2,522)
More than 12 months of temporary impairment | (2,838)
Total temporary impairment | $ (5,360)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 440
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 517,394
More than 12 months of temporary impairment | 142,390
Total temporary impairment | 659,784
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (1,155)
More than 12 months of temporary impairment | (1,288)
Total temporary impairment | $ (2,443)
Debt Securities Issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 108
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 173,618
More than 12 months of temporary impairment | 25,892
Total temporary impairment | 199,510
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (482)
More than 12 months of temporary impairment | (145)
Total temporary impairment | $ (627)
Debt Securities Issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 71
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 561,363
More than 12 months of temporary impairment | 154,006
Total temporary impairment | 715,369
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (862)
More than 12 months of temporary impairment | (1,378)
Total temporary impairment | $ (2,240)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 45
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 8,449
More than 12 months of temporary impairment | 9,319
Total temporary impairment | 17,768
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (23)
More than 12 months of temporary impairment | (27)
Total temporary impairment | $ (50)

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