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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Mar. 31, 2023 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 603
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 1,198,933
More than 12 months of temporary impairment | 486,918
Total temporary impairment | 1,685,851
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (6,134)
More than 12 months of temporary impairment | (14,173)
Total temporary impairment | $ (20,307)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 361
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 434,500
More than 12 months of temporary impairment | 291,713
Total temporary impairment | 726,213
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (1,697)
More than 12 months of temporary impairment | (9,534)
Total temporary impairment | $ (11,231)
Debt Securities Issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 68
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 138,211
More than 12 months of temporary impairment | 70,965
Total temporary impairment | 209,176
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (424)
More than 12 months of temporary impairment | (1,508)
Total temporary impairment | $ (1,932)
Debt Securities Issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 64
Estimated Fair Value [Abstract] |
Less than 12 months of temporary impairment | $ 603,444
More than 12 months of temporary impairment | 91,448
Total temporary impairment | 694,892
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (3,873)
More than 12 months of temporary impairment | (2,591)
Total temporary impairment | $ (6,464)
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 | $ 22,778
More than 12 months of temporary impairment | 32,792
Total temporary impairment | 55,570
Unrealized Losses [Abstract] |
Less than 12 months of temporary impairment | (140)
More than 12 months of temporary impairment | (540)
Total temporary impairment | $ (680)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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