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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Dec. 31, 2021 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 727
Estimated fair value, less than 12 months of temporary impairment | $ 934,791
Unrealized losses, less than 12 months of temporary impairment | $ (4,311)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 272
Estimated fair value, less than 12 months of temporary impairment | $ 552,966
Unrealized losses, less than 12 months of temporary impairment | $ (2,870)
Debt Securities Issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 15
Estimated fair value, less than 12 months of temporary impairment | $ 114,338
Unrealized losses, less than 12 months of temporary impairment | $ (579)
Debt Securities Issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 13
Estimated fair value, less than 12 months of temporary impairment | $ 134,987
Unrealized losses, less than 12 months of temporary impairment | $ (564)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 425
Estimated fair value, less than 12 months of temporary impairment | $ 126,401
Unrealized losses, less than 12 months of temporary impairment | $ (261)
Other Municipal Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 2
Estimated fair value, less than 12 months of temporary impairment | $ 6,099
Unrealized losses, less than 12 months of temporary impairment | $ (37)

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