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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2025
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 measured at fair value on a recurring basis as of the dates indicated.

March 31, 2025Level 1Level 2Level 3Total
Fair Value
(In thousands)
Financial assets:
Fixed maturity securities:
    
U.S. Treasury and U.S. Government-sponsored enterprises$5,938 3,351 — 9,289 
States and political subdivisions— 270,436 — 270,436 
Corporate42 816,511 — 816,553 
Commercial mortgage-backed— 311 — 311 
Residential mortgage-backed— 96,406 — 96,406 
Asset-backed— 54,433 — 54,433 
Total fixed maturity securities
5,980 1,241,448 — 1,247,428 
Equity securities:    
Bond mutual funds748 — — 748 
Common stocks
952 — — 952 
Non-redeemable preferred stock7 — — 7 
Non-redeemable preferred stock fund3,786 — — 3,786 
Total equity securities5,493 — — 5,493 
Other long-term investments (1)
— — — 93,036 
Total financial assets$11,473 1,241,448 — 1,345,957 
(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 are not classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.
December 31, 2024Level 1Level 2Level 3Total
Fair Value
(In thousands)
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 
Corporate42 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 funds739 — — 739 
Common stocks
810 — — 810 
Non-redeemable preferred stock7 — — 7 
Non-redeemable preferred stock fund3,891 — — 3,891 
Total equity securities5,447 — — 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 are not classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.
Fair Value Measurements, Recurring and Nonrecurring These investments are included in other long-term investments on the consolidated balance sheets.
March 31, 2025December 31, 2024
(In thousands, except for 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 marketInvestments in privately-originated, performing senior secured debt primarily in North America-based companies$34,307 1,660 2$35,369 1,660 3
Global equity fundInvestments in common stocks of U.S., international developed and emerging markets with a focus on long-term capital growth11,416 — 011,568 — 0
Late-stage growthInvestments in private late-stage, established companies seeking capital to accelerate growth prior to an IPO or sale31,676 5,498 
3 to 5
27,825 8,134 
3 to 5
InfrastructureInvestments in environmental infrastructure and related technology, focusing on renewable power generation and distribution15,637 5,364 
8 to 10
18,575 5,637 
9 to 10
Total limited partnerships$93,036 12,522 $93,337 15,431 
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:

 March 31, 2025December 31, 2024
(In thousands)Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
Financial assets:
    
Policy loans$70,961 70,961 71,216 71,216 
Residential mortgage loan31 31 33 34 
Cash and cash equivalents18,355 18,355 29,271 29,271 
Financial liabilities:
    
Annuity - investment contracts69,492 64,285 68,888 63,629 
Fair Value Option, Disclosures 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.
Carrying Value
(In thousands)
March 31, 2025December 31, 2024
Other long-term investments:
Limited partnerships$93,036 93,337 
FHLB common stock215 212 
Mortgage loans31 33 
Real estate held-for-sale
15 — 
All other investments21 22 
Total other long-term investments$93,318 93,604