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Allowance for Credit Losses (Reserve Allowance for Various Credit Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2022 | $ 8,105 | $ 6,407
Transition adjustment current expected credit losses | 3,621 | 1,698
December 31, 2023 | 11,726 | 8,105
Trade Receivables |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2022 | 6,236 | 3,789
Transition adjustment current expected credit losses | 2,047 | 2,447
December 31, 2023 | 8,283 | 6,236
Investments, Fixed Maturities |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2022 | 1,052 | 2,101
Transition adjustment current expected credit losses | 1,943 | 1,049
December 31, 2023 | 2,995 | 1,052
Investments, Other |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2022 | 817 | 517
Transition adjustment current expected credit losses | 369 | 300
December 31, 2023 | $ 448 | $ 817

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