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Investments (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments Including Short Term And Cash And Cash Equivalents [Abstract] |
Investments Including Short Term And Cash And Cash Equivalents [Table Text Block] | The Company invests primarily in fixed maturity securities as shown below.
Carrying Value (In thousands, except for %) | September 30, 2025 |  | December 31, 2024
Amount |  | % |  | Amount |  | %
Cash and invested assets: |  |  |  |  |  |  |
Fixed maturity securities | $ | 1,270,045 |  |  | 87.7 | % |  | 1,220,961 |  |  | 86.0 | %
Equity securities | 1,371 |  |  | 0.1 |  |  | 5,447 |  |  | 0.4 |
Policy loans | 68,717 |  |  | 4.7 |  |  | 71,216 |  |  | 5.0 |
Other long-term investments | 85,738 |  |  | 5.9 |  |  | 93,604 |  |  | 6.6 |
Cash and cash equivalents | 23,123 |  |  | 1.6 |  |  | 29,271 |  |  | 2.0 |
Total cash and invested assets | $ | 1,448,994 |  |  | 100.0 | % |  | 1,420,499 |  |  | 100.0 | %
Debt and Equity Securities, Unrealized Gain (Loss) |
Unrealized Gain (Loss) on Investments [Table Text Block] | The following tables represent the amortized cost, gross unrealized gains and losses and fair value of fixed maturity securities as of the dates indicated.
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
September 30, 2025 |  |  |
(In thousands) |  |  |
Fixed maturity securities: |  |  |  |  |  |  |
U.S. Treasury securities | $ | 5,704 |  |  | 77 |  |  | 92 |  |  | 5,689 |
U.S. Government-sponsored enterprises | 1,272 |  |  | 93 |  |  | — |  |  | 1,365 |
States and political subdivisions | 293,634 |  |  | 1,904 |  |  | 27,754 |  |  | 267,784 |
Corporate: |  |  |  |  |  |  |
Financial | 296,501 |  |  | 4,126 |  |  | 25,975 |  |  | 274,652 |
Consumer | 247,721 |  |  | 1,132 |  |  | 38,409 |  |  | 210,444 |
Utilities | 131,878 |  |  | 822 |  |  | 19,377 |  |  | 113,323 |
Energy | 83,805 |  |  | 303 |  |  | 7,430 |  |  | 76,678 |
Communications | 63,311 |  |  | 296 |  |  | 7,460 |  |  | 56,147 |
All other | 130,248 |  |  | 1,369 |  |  | 15,214 |  |  | 116,403 |
Commercial mortgage-backed | 308 |  |  | 4 |  |  | 2 |  |  | 310 |
Residential mortgage-backed | 105,767 |  |  | 13 |  |  | 8,373 |  |  | 97,407 |
Asset-backed | 49,477 |  |  | 899 |  |  | 533 |  |  | 49,843 |
Total fixed maturity securities | $ | 1,409,626 |  |  | 11,038 |  |  | 150,619 |  |  | 1,270,045 |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
December 31, 2024 |  |  |
(In thousands) |  |  |
Fixed maturity securities: |  |  |  |  |  |  |
U.S. Treasury securities | $ | 5,939 |  |  | 85 |  |  | 115 |  |  | 5,909 |
U.S. Government-sponsored enterprises | 3,152 |  |  | 152 |  |  | — |  |  | 3,304 |
States and political subdivisions | 300,757 |  |  | 1,087 |  |  | 33,542 |  |  | 268,302 |
Corporate: |  |  |  |  |  |  |
Financial | 272,925 |  |  | 1,593 |  |  | 33,285 |  |  | 241,233 |
Consumer | 263,242 |  |  | 899 |  |  | 45,955 |  |  | 218,186 |
Utilities | 126,361 |  |  | 220 |  |  | 22,770 |  |  | 103,811 |
Energy | 79,247 |  |  | 40 |  |  | 9,959 |  |  | 69,328 |
Communications | 70,896 |  |  | 111 |  |  | 9,910 |  |  | 61,097 |
All other | 117,387 |  |  | 315 |  |  | 16,368 |  |  | 101,334 |
Commercial mortgage-backed | 315 |  |  | 1 |  |  | 5 |  |  | 311 |
Residential mortgage-backed | 106,661 |  |  | 7 |  |  | 13,026 |  |  | 93,642 |
Asset-backed | 54,419 |  |  | 891 |  |  | 806 |  |  | 54,504 |
Total fixed maturity securities | $ | 1,401,301 |  |  | 5,401 |  |  | 185,741 |  |  | 1,220,961 |
Equity Securities, Restricted |
Schedule of Equity Securities [Table Text Block] | The Company's investments in equity securities are shown below.
Fair Value (In thousands) | September 30, 2025 |  | December 31, 2024
Equity securities: |  |  |
Bond mutual funds | $ | 222 |  |  | 739 |
Common stocks | 1,142 |  |  | 810 |
Non-redeemable preferred stock | 7 |  |  | 7 |
Non-redeemable preferred stock fund | — |  |  | 3,891 |
Total equity securities | $ | 1,371 |  |  | 5,447 |
Unrealized Continuous Losses on Investments [Abstract] |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value | For fixed maturity security investments that have unrealized losses as of September 30, 2025 and December 31, 2024, the gross unrealized losses and related fair values that have been in a continuous unrealized loss position by timeframe are as follows.
September 30, 2025 | Less than 12 months |  | Greater than 12 months |  | Total
(In thousands, except for # of securities) | Fair Value | Unrealized Losses | # of Securities |  | Fair Value | Unrealized Losses | # of Securities |  | Fair Value | Unrealized Losses | # of Securities
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities | $ | 470 |  | 2 |  | 2 |  |  | 828 |  | 90 |  | 6 |  |  | 1,298 |  | 92 |  | 8 |
States and political subdivisions | 21,630 |  | 382 |  | 25 |  |  | 149,134 |  | 27,372 |  | 181 |  |  | 170,764 |  | 27,754 |  | 206 |
Corporate: |  |  |  |  |  |  |  |  |  |  |
Financial | 17,197 |  | 231 |  | 33 |  |  | 147,423 |  | 25,744 |  | 178 |  |  | 164,620 |  | 25,975 |  | 211 |
Consumer | 25,206 |  | 709 |  | 31 |  |  | 159,917 |  | 37,700 |  | 218 |  |  | 185,123 |  | 38,409 |  | 249 |
Utilities | 12,308 |  | 178 |  | 34 |  |  | 79,033 |  | 19,199 |  | 140 |  |  | 91,341 |  | 19,377 |  | 174 |
Energy | 13,304 |  | 160 |  | 29 |  |  | 45,449 |  | 7,270 |  | 53 |  |  | 58,753 |  | 7,430 |  | 82 |
Communications | 6,269 |  | 49 |  | 10 |  |  | 41,961 |  | 7,411 |  | 50 |  |  | 48,230 |  | 7,460 |  | 60 |
All Other | 7,481 |  | 207 |  | 17 |  |  | 73,067 |  | 15,007 |  | 95 |  |  | 80,548 |  | 15,214 |  | 112 |
Commercial mortgage-backed | — |  | — |  | — |  |  | 85 |  | 2 |  | 1 |  |  | 85 |  | 2 |  | 1 |
Residential mortgage-backed | 1,574 |  | 2 |  | 7 |  |  | 94,084 |  | 8,371 |  | 79 |  |  | 95,658 |  | 8,373 |  | 86 |
Asset-backed | 4,728 |  | 175 |  | 7 |  |  | 9,768 |  | 358 |  | 11 |  |  | 14,496 |  | 533 |  | 18 |
Total fixed maturity securities | $ | 110,167 |  | 2,095 |  | 195 |  |  | 800,749 |  | 148,524 |  | 1,012 |  |  | 910,916 |  | 150,619 |  | 1,207 |
December 31, 2024 | Less than 12 months |  | Greater than 12 months |  | Total
(In thousands, except for # of securities) | Fair Value | Unrealized Losses | # of Securities |  | Fair Value | Unrealized Losses | # of Securities |  | Fair Value | Unrealized Losses | # of Securities
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities | $ | 835 |  | 51 |  | 3 |  |  | 435 |  | 64 |  | 5 |  |  | 1,270 |  | 115 |  | 8 |
States and political subdivisions | 42,583 |  | 1,484 |  | 63 |  |  | 147,534 |  | 32,058 |  | 177 |  |  | 190,117 |  | 33,542 |  | 240 |
Corporate: |  |  |  |  |  |  |  |  |  |  |
Financial | 29,258 |  | 756 |  | 53 |  |  | 154,448 |  | 32,529 |  | 192 |  |  | 183,706 |  | 33,285 |  | 245 |
Consumer | 37,231 |  | 2,053 |  | 57 |  |  | 161,795 |  | 43,902 |  | 216 |  |  | 199,026 |  | 45,955 |  | 273 |
Utilities | 16,750 |  | 687 |  | 47 |  |  | 79,488 |  | 22,083 |  | 142 |  |  | 96,238 |  | 22,770 |  | 189 |
Energy | 11,654 |  | 438 |  | 29 |  |  | 52,537 |  | 9,521 |  | 65 |  |  | 64,191 |  | 9,959 |  | 94 |
Communications | 9,973 |  | 250 |  | 11 |  |  | 48,462 |  | 9,660 |  | 60 |  |  | 58,435 |  | 9,910 |  | 71 |
All Other | 25,208 |  | 1,237 |  | 38 |  |  | 68,756 |  | 15,131 |  | 87 |  |  | 93,964 |  | 16,368 |  | 125 |
Commercial mortgage-backed | 100 |  | — |  | 1 |  |  | 89 |  | 5 |  | 1 |  |  | 189 |  | 5 |  | 2 |
Residential mortgage-backed | 160 |  | 2 |  | 11 |  |  | 93,231 |  | 13,024 |  | 84 |  |  | 93,391 |  | 13,026 |  | 95 |
Asset-backed | 10,330 |  | 243 |  | 14 |  |  | 14,741 |  | 563 |  | 16 |  |  | 25,071 |  | 806 |  | 30 |
Total fixed maturity securities | $ | 184,082 |  | 7,201 |  | 327 |  |  | 821,516 |  | 178,540 |  | 1,045 |  |  | 1,005,598 |  | 185,741 |  | 1,372 |
Debt and Equity Securities, Realized Gain (Loss) |
Schedule of Realized Gain (Loss) [Table Text Block] | The Company uses the specific identification method of the individual security to determine the cost basis used in the calculation of realized gains and losses related to security sales.
| Three Months Ended |  | Nine Months Ended |  |  |  |
| September 30, |  | September 30, |  |  |  |
(In thousands) | 2025 | 2024 |  | 2025 | 2024 |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |  |  |  |
Proceeds | $ | 45,574 |  | — |  |  | 60,143 |  | 4,659 |  |  |  |  |  |  |
Gross realized gains | $ | 868 |  | — |  |  | 960 |  | 91 |  |  |  |  |  |  |
Gross realized losses | $ | 75 |  | — |  |  | 517 |  | 196 |  |  |  |  |  |  |
During the second quarter of 2025, the Company accepted a tender offer by Discovery Communications, Inc. after considering the outlook of the issuer. As a result, the Company recognized a realized loss of $0.4 million, which is recorded a net realized investment loss for the period.
Schedule of Maturities by Contractual Maturity Date [Abstract] |
Investments Classified by Contractual Maturity Date [Table Text Block] | The amortized cost and fair value of fixed maturity securities at September 30, 2025 by contractual maturity are shown in the table below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date have been reflected based upon final stated maturity.
September 30, 2025 | Amortized Cost |  | Fair Value
(In thousands) |
Fixed maturity securities: |  |  |
Due in one year or less | $ | 31,925 |  |  | 31,911 |
Due after one year through five years | 117,290 |  |  | 117,944 |
Due after five years through ten years | 281,140 |  |  | 281,669 |
Due after ten years | 979,271 |  |  | 838,521 |
Total fixed maturity securities | $ | 1,409,626 |  |  | 1,270,045 |

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