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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, 2025 | Mar. 31, 2025
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2022 | $ 8,634 | $ 8,105
Transition adjustment current expected credit losses | 2,894 | 12,217
Write-offs against allowance | 3,105 | 11,688
December 31, 2023 | 8,423 | 8,634
Trade Receivables |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2022 | 5,082 | 6,236
Transition adjustment current expected credit losses | 3,555 | 10,534
Write-offs against allowance | 3,105 | 11,688
December 31, 2023 | 5,532 | 5,082
Investments, Fixed Maturities |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2022 | 3,104 | 1,052
Transition adjustment current expected credit losses | 661 | 2,052
December 31, 2023 | 2,443 | 3,104
Investments, Other |  |
Valuation And Qualifying Accounts [Abstract] |  |
March 31, 2022 | 448 | 817
Transition adjustment current expected credit losses |  | 369
December 31, 2023 | $ 448 | $ 448

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