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Investments (Table Text Block) | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract] |  |
Available-for-Sale Investments |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses More than 12 Months |  | Gross Unrealized Losses Less than 12 Months |  | Estimated Market Value
|  | (In thousands)
U.S. treasury securities and government obligations | $ | 123,474 | $ | 2,892 | $ | – | $ | (1,675) | $ | 124,691
U.S. government agency mortgage-backed securities |  | 27,908 |  | 1,070 |  | (6) |  | (377) |  | 28,595
Obligations of states and political subdivisions |  | 159,417 |  | 9,466 |  | (23) |  | (424) |  | 168,436
Corporate securities |  | 1,263,703 |  | 32,901 |  | (5,731) |  | (13,837) |  | 1,277,036
Mortgage-backed securities |  | 26,577 |  | 515 |  | – |  | (5) |  | 27,087
Redeemable preferred stocks |  | 13,789 |  | 168 |  | – |  | (468) |  | 13,489
Common stocks |  | 15,732 |  | 8,728 |  | (10) |  | (16) |  | 24,434
| $ | 1,630,600 | $ | 55,740 | $ | (5,770) | $ | (16,802) | $ | 1,663,768
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses More than 12 Months |  | Gross Unrealized Losses Less than 12 Months |  | Estimated Market Value
|  | (In thousands)
U.S. treasury securities and government obligations | $ | 85,861 | $ | 3,791 | $ | – | $ | (193) | $ | 89,459
U.S. government agency mortgage-backed securities |  | 21,845 |  | 1,596 |  | (6) |  | (39) |  | 23,396
Obligations of states and political subdivisions |  | 166,725 |  | 10,660 |  | (81) |  | (414) |  | 176,890
Corporate securities |  | 1,143,125 |  | 26,861 |  | (8,013) |  | (28,181) |  | 1,133,792
Mortgage-backed securities |  | 24,991 |  | 475 |  | – |  | (62) |  | 25,404
Redeemable preferred stocks |  | 17,977 |  | 556 |  | – |  | (105) |  | 18,428
Common stocks |  | 15,983 |  | 7,822 |  | (10) |  | (375) |  | 23,420
| $ | 1,476,507 | $ | 51,761 | $ | (8,110) | $ | (29,369) | $ | 1,490,789
Adjusted Cost and Estimated Market Value of Available-for-sale Investments |
|  | March 31, 2017 |  | March 31, 2016
|  | Amortized Cost |  | Estimated Market Value |  | Amortized Cost |  | Estimated Market Value
|  | (In thousands)
Due in one year or less | $ | 35,399 | $ | 35,795 | $ | 48,679 | $ | 49,146
Due after one year through five years |  | 324,286 |  | 333,016 |  | 250,576 |  | 256,597
Due after five years through ten years |  | 598,232 |  | 607,184 |  | 557,984 |  | 557,961
Due after ten years |  | 616,585 |  | 622,763 |  | 560,317 |  | 559,833
|  | 1,574,502 |  | 1,598,758 |  | 1,417,556 |  | 1,423,537
Mortgage backed securities |  | 26,577 |  | 27,087 |  | 24,991 |  | 25,404
Redeemable preferred stocks |  | 13,789 |  | 13,489 |  | 17,977 |  | 18,428
Equity securities |  | 15,732 |  | 24,434 |  | 15,983 |  | 23,420
| $ | 1,630,600 | $ | 1,663,768 | $ | 1,476,507 | $ | 1,490,789
Carrying Value of Other Investments |
|  | March 31,
|  | 2017 |  | 2016
|  | (In thousands)
Mortgage loans, net | $ | 262,875 | $ | 217,198
Short-term investments |  | 15,149 |  | 34,798
Real estate |  | 66,174 |  | 34,416
Policy loans |  | 17,112 |  | 17,091
Other equity investments |  | 6,520 |  | 8,318
| $ | 367,830 | $ | 311,821

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of the investment holdings which are represented by other than securities (for example, commodities). The investment holdings, other than securities investments table lists the long positions of non-security investments held by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010 + Details
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