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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2024
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | The following tables set forth our assets that are measured at fair value on a recurring basis as of the dates indicated.
December 31, 2024 (In thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value
Financial assets: |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |
U.S. Treasury and U.S. Government-sponsored enterprises | $ | 5,909 |  |  | 3,304 |  |  | — |  |  | 9,213 |
States and political subdivisions | — |  |  | 268,302 |  |  | — |  |  | 268,302 |
Corporate | 42 |  |  | 794,947 |  |  | — |  |  | 794,989 |
Commercial mortgage-backed | — |  |  | 311 |  |  | — |  |  | 311 |
Residential mortgage-backed | — |  |  | 93,642 |  |  | — |  |  | 93,642 |
Asset-backed | — |  |  | 54,504 |  |  | — |  |  | 54,504 |
Total fixed maturity securities | 5,951 |  |  | 1,215,010 |  |  | — |  |  | 1,220,961 |
Equity securities: |  |  |  |  |  |  |
Bond mutual funds | 739 |  |  | — |  |  | — |  |  | 739 |
Common stock | 810 |  |  | — |  |  | — |  |  | 810 |
Non-redeemable preferred stock | 7 |  |  | — |  |  | — |  |  | 7 |
Non-redeemable preferred stock fund | 3,891 |  |  | — |  |  | — |  |  | 3,891 |
Total equity securities | 5,447 |  |  | — |  |  | — |  |  | 5,447 |
Other long-term investments (1) | — |  |  | — |  |  | — |  |  | 93,337 |
Total financial assets | $ | 11,398 |  |  | 1,215,010 |  |  | — |  |  | 1,319,745 |
(1) In accordance with Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet.
December 31, 2023 (In thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value
Financial assets: |  |  |  |  |  |  |
Fixed maturity securities: |  |  |  |  |  |  |
U.S. Treasury and U.S. Government-sponsored enterprises | $ | 6,062 |  |  | 3,653 |  |  | — |  |  | 9,715 |
States and political subdivisions | — |  |  | 287,231 |  |  | — |  |  | 287,231 |
Corporate | 43 |  |  | 787,564 |  |  | — |  |  | 787,607 |
Commercial mortgage-backed | — |  |  | 171 |  |  | — |  |  | 171 |
Residential mortgage-backed | — |  |  | 97,123 |  |  | — |  |  | 97,123 |
Asset-backed | — |  |  | 57,134 |  |  | — |  |  | 57,134 |
Total fixed maturity securities | 6,105 |  |  | 1,232,876 |  |  | — |  |  | 1,238,981 |
Equity securities: |  |  |  |  |  |  |
Bond mutual funds | 740 |  |  | — |  |  | — |  |  | 740 |
Common stock | 665 |  |  | — |  |  | — |  |  | 665 |
Non-redeemable preferred stock | 7 |  |  | — |  |  | — |  |  | 7 |
Non-redeemable preferred stock fund | 3,870 |  |  | — |  |  | — |  |  | 3,870 |
Total equity securities | 5,282 |  |  | — |  |  | — |  |  | 5,282 |
Other long-term investments (1) | — |  |  | — |  |  | — |  |  | 82,460 |
Total financial assets | $ | 11,387 |  |  | 1,232,876 |  |  | — |  |  | 1,326,723 |
(1) In accordance with Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet.
Schedule of Limited Partners' Capital Account by Class [Table Text Block] | These investments are included in other long-term investments on the consolidated balance sheets.
|  | December 31, 2024 |  | December 31, 2023
(In thousands, except years) |  | Fair Value Using NAV Per Share | Unfunded Commit- ments | Range (In years) |  | Fair Value Using NAV Per Share | Unfunded Commit- ments | Range (In years)
Description |
Limited partnerships: |  |  |  |  |  |  |
Middle market | Investments in privately-originated, performing senior secured debt primarily in North America-based companies | $ | 35,369 |  | 1,660 |  | 3 |  | $ | 34,858 |  | 3,452 |  | 4
Global equity fund | Investments in common stocks of U.S., international developed and emerging markets with a focus on long-term capital growth | 11,568 |  | — |  | 0 |  | 10,345 |  | — |  | 0
Late-stage growth | Investments in private late-stage, established companies seeking capital to accelerate growth prior to an IPO or sale | 27,825 |  | 8,134 |  | 3 to 5 |  | 20,524 |  | 14,271 |  | 4 to 6
Infrastructure | Investments in environmental infrastructure and related technology, focusing on renewable power generation and distribution | 18,575 |  | 5,637 |  | 9 |  | 16,733 |  | 9,576 |  | 10
Total limited partnerships | $ | 93,337 |  | 15,431 |  |  |  | $ | 82,460 |  | 27,299 |  |
Fair Value, by Balance Sheet Grouping [Table Text Block] | The carrying amount and fair value for the financial assets and liabilities on the consolidated financial statements not otherwise disclosed for the periods indicated were as follows:
| December 31, 2024 |  | December 31, 2023
(In thousands) | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Financial assets: |  |  |  |  |  |  |
Policy loans | $ | 71,216 |  |  | 71,216 |  |  | 75,359 |  |  | 75,359 |
Residential mortgage loans | 33 |  |  | 34 |  |  | 42 |  |  | 42 |
Cash and cash equivalents | 29,271 |  |  | 29,271 |  |  | 26,997 |  |  | 26,997 |
Financial liabilities: |  |  |  |  |  |  |
Annuity - investment contracts | 68,888 |  |  | 63,629 |  |  | 67,690 |  |  | 63,283 |
Other long-term investments. Financial instruments included in other long-term investments are classified in various levels of the fair value hierarchy. The following table summarizes the carrying amounts of these investments.
As of December 31, (In thousands) | 2024 | 2023
Other long-term investments: |  |
Limited partnerships | $ | 93,337 |  | 82,460 |
FHLB common stock | 212 |  | 202 |
Mortgage loans | 33 |  | 42 |
All other investments | 22 |  | 21 |
Total other long-term investments | $ | 93,604 |  | 82,725 |
We carried no limited partnership investments at cost at either December 31, 2024 or December 31, 2023. We are a member of the FHLB of Dallas and such membership requires members to own stock in the FHLB. Our FHLB stock is carried at amortized cost, which approximates fair value.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the varying rights, preferences and privileges of each class of limited partnership interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-5 + Details
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