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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Mar. 31, 2022 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 1,017
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 1,324,532
More than 12 months of temporary impairment | 36,305
Total temporary impairment | 1,360,837
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (18,042)
More than 12 months of temporary impairment | (992)
Total temporary impairment | $ (19,034)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 337
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 647,390
More than 12 months of temporary impairment | 11,300
Total temporary impairment | 658,690
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (11,694)
More than 12 months of temporary impairment | (347)
Total temporary impairment | $ (12,041)
Debt Securities Issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 14
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 95,543
More than 12 months of temporary impairment | 9,685
Total temporary impairment | 105,228
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (1,697)
More than 12 months of temporary impairment | (326)
Total temporary impairment | $ (2,023)
Debt Securities Issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 44
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 406,747
More than 12 months of temporary impairment | 4,860
Total temporary impairment | 411,607
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (3,539)
More than 12 months of temporary impairment | (138)
Total temporary impairment | $ (3,677)
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 619
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 173,537
More than 12 months of temporary impairment | 5,455
Total temporary impairment | 178,992
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (1,096)
More than 12 months of temporary impairment | (98)
Total temporary impairment | $ (1,194)
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 | $ 1,315
More than 12 months of temporary impairment | 5,005
Total temporary impairment | 6,320
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (16)
More than 12 months of temporary impairment | (83)
Total temporary impairment | $ (99)

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