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Investments (Available for sale equity investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Mar. 31, 2022
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Debt Securities Trading And Equity Securities FvNi Cost [Abstract] |  |
Amortized cost, equity investments | $ 55,740 | $ 53,728
Estimated market value, equity investments | 59,673 | 72,307
Common Stock [Member] |  |
Debt Securities Trading And Equity Securities FvNi Cost [Abstract] |  |
Amortized cost, equity investments | 29,686 | 27,674
Estimated market value, equity investments | 37,619 | 46,212
Nonredeemable Preferred Stock [Member] |  |
Debt Securities Trading And Equity Securities FvNi Cost [Abstract] |  |
Amortized cost, equity investments | 26,054 | 26,054
Estimated market value, equity investments | $ 22,054 | $ 26,095

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