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Investments (Available For Sale Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Mar. 31, 2016
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Available-for-sale securities, investments: |  |
Amortized cost | $ 1,601,188 | $ 1,496,256
Gross unrealized gains | 105,561 | 51,761
Gross unrealized losses more than 12 months | (4,431) | (8,110)
Gross unrealized losses less than 12 months | (1,737) | (29,369)
Estimated market value | 1,700,581 | 1,510,538
U.S. treasury securities and government obligations [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 87,116 | 85,861
Gross unrealized gains | 6,872 | 3,791
Gross unrealized losses more than 12 months |  |
Gross unrealized losses less than 12 months | (80) | (193)
Estimated market value | 93,908 | 89,459
U.S. government agency mortgage-backed securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 28,935 | 21,845
Gross unrealized gains | 1,940 | 1,596
Gross unrealized losses more than 12 months | (5) | (6)
Gross unrealized losses less than 12 months | (2) | (39)
Estimated market value | 30,868 | 23,396
Obligations of states and political subdivisions [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 159,596 | 166,725
Gross unrealized gains | 15,829 | 10,660
Gross unrealized losses more than 12 months | (12) | (81)
Gross unrealized losses less than 12 months | (90) | (414)
Estimated market value | 175,323 | 176,890
Corporate securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 1,250,266 | 1,143,125
Gross unrealized gains | 70,953 | 26,861
Gross unrealized losses more than 12 months | (4,404) | (8,013)
Gross unrealized losses less than 12 months | (1,411) | (28,181)
Estimated market value | 1,315,404 | 1,133,792
Mortgage-backed securities [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 42,665 | 42,991
Gross unrealized gains | 1,214 | 475
Gross unrealized losses more than 12 months |  |
Gross unrealized losses less than 12 months | (58) | (62)
Estimated market value | 43,821 | 43,404
Redeemable preferred stocks [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 14,640 | 17,977
Gross unrealized gains | 492 | 556
Gross unrealized losses more than 12 months |  |
Gross unrealized losses less than 12 months | (96) | (105)
Estimated market value | 15,036 | 18,428
Common stocks [Member] |  |
Available-for-sale securities, investments: |  |
Amortized cost | 17,970 | 17,732
Gross unrealized gains | 8,261 | 7,822
Gross unrealized losses more than 12 months | (10) | (10)
Gross unrealized losses less than 12 months |  | (375)
Estimated market value | $ 26,221 | $ 25,169

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- Definition Amount of accumulated unrealized loss on investments in debt and/or equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or less. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and/or equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
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- Definition We used "AvailableForSaleSecuritiesGrossUnrealizedGainLoss" in prior filings for this concept, but the 2013 taxonomy deprecated the above concept and created a new one with the period type changed to 'duration.' We must have an 'instant' period type in order to complete the calculation within this schedule. This is the unrealized gain on all our available-for-sale investments as of the quarter ending date. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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