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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Sep. 30, 2022 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 644
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 1,345,270
More than 12 months of temporary impairment | 266,568
Total temporary impairment | 1,611,838
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (20,769)
More than 12 months of temporary impairment | (11,860)
Total temporary impairment | $ (32,629)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 397
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 591,245
More than 12 months of temporary impairment | 133,763
Total temporary impairment | 725,008
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (10,897)
More than 12 months of temporary impairment | (7,084)
Total temporary impairment | $ (17,981)
Debt Securities Issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 31
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 69,640
More than 12 months of temporary impairment | 53,299
Total temporary impairment | 122,939
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (875)
More than 12 months of temporary impairment | (2,352)
Total temporary impairment | $ (3,227)
Debt Securities Issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 74
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 643,231
More than 12 months of temporary impairment | 52,767
Total temporary impairment | 695,998
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (8,327)
More than 12 months of temporary impairment | (1,681)
Total temporary impairment | $ (10,008)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 140
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 40,160
More than 12 months of temporary impairment | 21,769
Total temporary impairment | 61,929
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (658)
More than 12 months of temporary impairment | (679)
Total temporary impairment | $ (1,337)
Other Municipal Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 2
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 994
More than 12 months of temporary impairment | 4,970
Total temporary impairment | 5,964
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (12)
More than 12 months of temporary impairment | (64)
Total temporary impairment | $ (76)

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