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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Mar. 31, 2025 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 312
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 783,821
More than 12 months of temporary impairment | 22,876
Total temporary impairment | 806,697
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (1,650)
More than 12 months of temporary impairment | (76)
Total temporary impairment | $ (1,726)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 244
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 466,130
More than 12 months of temporary impairment | 9,945
Total temporary impairment | 476,075
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (1,236)
More than 12 months of temporary impairment | (20)
Total temporary impairment | $ (1,256)
Debt Securities Issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 26
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 45,578
More than 12 months of temporary impairment | 0
Total temporary impairment | 45,578
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (148)
More than 12 months of temporary impairment | 0
Total temporary impairment | $ (148)
Debt Securities Issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 40
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 271,642
More than 12 months of temporary impairment | 12,931
Total temporary impairment | 284,573
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (266)
More than 12 months of temporary impairment | (56)
Total temporary impairment | $ (322)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 2
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 471
More than 12 months of temporary impairment | 0
Total temporary impairment | 471
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | 0
More than 12 months of temporary impairment | 0
Total temporary impairment | $ 0

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