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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Jun. 30, 2022 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 845
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 1,310,175
More than 12 months of temporary impairment | 76,946
Total temporary impairment | 1,387,121
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (21,736)
More than 12 months of temporary impairment | (2,193)
Total temporary impairment | $ (23,929)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 380
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 703,643
More than 12 months of temporary impairment | 42,106
Total temporary impairment | 745,749
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (14,199)
More than 12 months of temporary impairment | (1,092)
Total temporary impairment | $ (15,291)
Debt Securities Issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 11
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 65,974
More than 12 months of temporary impairment | 14,400
Total temporary impairment | 80,374
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (1,781)
More than 12 months of temporary impairment | (597)
Total temporary impairment | $ (2,378)
Debt Securities Issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 48
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 420,076
More than 12 months of temporary impairment | 4,837
Total temporary impairment | 424,913
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (4,767)
More than 12 months of temporary impairment | (162)
Total temporary impairment | $ (4,929)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 403
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 119,174
More than 12 months of temporary impairment | 10,617
Total temporary impairment | 129,791
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (975)
More than 12 months of temporary impairment | (266)
Total temporary impairment | $ (1,241)
Other Municipal Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 3
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 1,308
More than 12 months of temporary impairment | 4,986
Total temporary impairment | 6,294
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (14)
More than 12 months of temporary impairment | (76)
Total temporary impairment | $ (90)

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