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Investments (Table Text Block) | 12 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract] |  |
Available-for-Sale Investments | Available-for-sale investments at March 31, 2016 were as follows:
|  | 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 |  | 42,991 |  | 475 |  | – |  | (62) |  | 43,404
Redeemable preferred stocks |  | 17,977 |  | 556 |  | – |  | (105) |  | 18,428
Common stocks |  | 17,732 |  | 7,822 |  | (10) |  | (375) |  | 25,169
| $ | 1,496,256 | $ | 51,761 | $ | (8,110) | $ | (29,369) | $ | 1,510,538
| Available-for-sale investments at March 31, 2015 were as follows:
|  | 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 | $ | 99,722 | $ | 5,658 | $ | (64) | $ | – | $ | 105,316
U.S. government agency mortgage-backed securities |  | 30,569 |  | 2,614 |  | (39) |  | (3) |  | 33,141
Obligations of states and political subdivisions |  | 165,724 |  | 13,052 |  | (298) |  | (10) |  | 178,468
Corporate securities |  | 885,470 |  | 44,426 |  | (2,522) |  | (2,966) |  | 924,408
Mortgage-backed securities |  | 19,874 |  | 806 |  | (1) |  | – |  | 20,679
Redeemable preferred stocks |  | 18,052 |  | 521 |  | (253) |  | (24) |  | 18,296
Common stocks |  | 17,975 |  | 6,719 |  | – |  | (40) |  | 24,654
| $ | 1,237,386 | $ | 73,796 | $ | (3,177) | $ | (3,043) | $ | 1,304,962
Adjusted Cost and Estimated Market Value of Available-for-sale Investments |
|  | March 31, 2016 |  | March 31, 2015
|  | Amortized Cost |  | Estimated Market Value |  | Amortized Cost |  | Estimated Market Value
|  | (In thousands)
Due in one year or less | $ | 48,679 | $ | 49,146 | $ | 36,355 | $ | 37,055
Due after one year through five years |  | 250,576 |  | 256,597 |  | 198,488 |  | 209,404
Due after five years through ten years |  | 557,984 |  | 557,961 |  | 474,639 |  | 492,782
Due after ten years |  | 560,317 |  | 559,833 |  | 472,003 |  | 502,092
|  | 1,417,556 |  | 1,423,537 |  | 1,181,485 |  | 1,241,333
Mortgage backed securities |  | 42,991 |  | 43,404 |  | 19,874 |  | 20,679
Redeemable preferred stocks |  | 17,977 |  | 18,428 |  | 18,052 |  | 18,296
Equity securities |  | 17,732 |  | 25,169 |  | 17,975 |  | 24,654
| $ | 1,496,256 | $ | 1,510,538 | $ | 1,237,386 | $ | 1,304,962
Carrying Value of Other Investments | The carrying value of other investments was as follows:
|  | March 31,
|  | 2016 |  | 2015
|  | (In thousands)
Mortgage loans, net | $ | 217,198 | $ | 161,851
Short-term investments |  | 34,798 |  | 47,739
Real estate |  | 34,416 |  | 34,597
Policy loans |  | 17,091 |  | 16,431
Other equity investments |  | 6,569 |  | 8,102
| $ | 310,072 | $ | 268,720

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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=27724398&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=27724398&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=27724398&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=27724398&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=27724398&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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Article 12 + Details
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