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Investments (Available for sale equity investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018
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Marketable Securities [Abstract] |  |
Amortized cost, equity investments | $ 17,574 | $ 24,223
Estimated market value, equity investments | 24,168 | 36,476
Common stocks [Member] |  |
Marketable Securities [Abstract] |  |
Amortized cost, equity investments | 10,123 | 15,732
Estimated market value, equity investments | 17,379 | 27,862
Non-redeemable preferred stocks [Member] |  |
Marketable Securities [Abstract] |  |
Amortized cost, equity investments | 7,451 | 8,491
Estimated market value, equity investments | $ 6,789 | $ 8,614

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. + References No definition available. + Details
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- Details
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