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Investments (Available for sale equity investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Mar. 31, 2024
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Debt Securities Trading And Equity Securities FvNi Cost [Abstract] |  |
Amortized cost, equity investments | $ 54,635 | $ 54,748
Estimated market value, equity investments | 67,667 | 66,274
Common Stock [Member] |  |
Debt Securities Trading And Equity Securities FvNi Cost [Abstract] |  |
Amortized cost, equity investments | 29,491 | 29,604
Estimated market value, equity investments | 44,796 | 45,014
Nonredeemable Preferred Stock [Member] |  |
Debt Securities Trading And Equity Securities FvNi Cost [Abstract] |  |
Amortized cost, equity investments | 25,144 | 25,144
Estimated market value, equity investments | $ 22,871 | $ 21,260

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