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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Dec. 31, 2022 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 619
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 1,112,941
More than 12 months of temporary impairment | 499,383
Total temporary impairment | 1,612,324
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (9,474)
More than 12 months of temporary impairment | (18,165)
Total temporary impairment | $ (27,639)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 384
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 384,136
More than 12 months of temporary impairment | 305,367
Total temporary impairment | 689,503
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (2,629)
More than 12 months of temporary impairment | (11,879)
Total temporary impairment | $ (14,508)
Debt Securities Issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 48
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 93,862
More than 12 months of temporary impairment | 70,233
Total temporary impairment | 164,095
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (538)
More than 12 months of temporary impairment | (2,331)
Total temporary impairment | $ (2,869)
Debt Securities Issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 75
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 616,826
More than 12 months of temporary impairment | 86,325
Total temporary impairment | 703,151
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (6,082)
More than 12 months of temporary impairment | (3,151)
Total temporary impairment | $ (9,233)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 110
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 18,117
More than 12 months of temporary impairment | 31,465
Total temporary impairment | 49,582
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (225)
More than 12 months of temporary impairment | (790)
Total temporary impairment | $ (1,015)
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 | $ 0
More than 12 months of temporary impairment | 5,993
Total temporary impairment | 5,993
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | 0
More than 12 months of temporary impairment | (14)
Total temporary impairment | $ (14)

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