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Investments (Table Text Block) | 3 Months Ended
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Jun. 30, 2019 | Mar. 31, 2019
Investments Debt 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
|  | (Unaudited)
|  | (In thousands)
U.S. treasury securities and government obligations | $ | 135,055 | $ | 3,709 | $ | (913) | $ | (24) | $ | 137,827
U.S. government agency mortgage-backed securities |  | 41,359 |  | 442 |  | (95) |  | (35) |  | 41,671
Obligations of states and political subdivisions |  | 301,255 |  | 13,579 |  | (198) |  | 0 |  | 314,636
Corporate securities |  | 1,639,004 |  | 36,966 |  | (9,868) |  | (1,350) |  | 1,664,752
Mortgage-backed securities |  | 147,102 |  | 2,834 |  | (127) |  | (6) |  | 149,803
Redeemable preferred stocks |  | 1,493 |  | 57 |  | 0 |  | 0 |  | 1,550
| $ | 2,265,268 | $ | 57,587 | $ | (11,201) | $ | (1,415) | $ | 2,310,239
|  | 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 | $ | 136,010 | $ | 2,409 | $ | (2,104) | $ | (447) | $ | 135,868
U.S. government agency mortgage-backed securities |  | 31,101 |  | 433 |  | (146) |  | (19) |  | 31,369
Obligations of states and political subdivisions |  | 298,955 |  | 8,079 |  | (233) |  | (905) |  | 305,896
Corporate securities |  | 1,613,199 |  | 14,777 |  | (14,257) |  | (24,986) |  | 1,588,733
Mortgage-backed securities |  | 148,203 |  | 880 |  | (285) |  | (903) |  | 147,895
Redeemable preferred stocks |  | 1,493 |  | 20 |  | 0 |  | (45) |  | 1,468
| $ | 2,228,961 | $ | 26,598 | $ | (17,025) | $ | (27,305) | $ | 2,211,229
Adjusted Cost and Estimated Market Value of Available-for-sale Investments |
|  | June 30, 2019 |  | March 31, 2019
|  | Amortized Cost |  | Estimated Market Value |  | Amortized Cost |  | Estimated Market Value
|  | (Unaudited) |  |
|  | (In thousands)
Due in one year or less | $ | 80,244 | $ | 80,481 | $ | 71,987 | $ | 71,954
Due after one year through five years |  | 553,626 |  | 562,599 |  | 541,195 |  | 540,658
Due after five years through ten years |  | 646,677 |  | 660,403 |  | 621,031 |  | 614,485
Due after ten years |  | 836,126 |  | 855,403 |  | 845,052 |  | 834,769
|  | 2,116,673 |  | 2,158,886 |  | 2,079,265 |  | 2,061,866
Mortgage-backed securities |  | 147,102 |  | 149,803 |  | 148,203 |  | 147,895
Redeemable preferred stocks |  | 1,493 |  | 1,550 |  | 1,493 |  | 1,468
| $ | 2,265,268 | $ | 2,310,239 | $ | 2,228,961 | $ | 2,211,229
Available for sale equity investments |
|  | June 30, 2019 |  | March 31, 2019
|  | Amortized Cost |  | Estimated Market Value |  | Amortized Cost |  | Estimated Market Value
|  | (Unaudited) |  |  |  |
|  | (In thousands)
Common stocks | $ | 10,123 | $ | 19,035 | $ | 10,123 | $ | 17,379
Non-redeemable preferred stocks |  | 7,451 |  | 7,311 |  | 7,451 |  | 6,789
| $ | 17,574 | $ | 26,346 | $ | 17,574 | $ | 24,168

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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 No definition available. + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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