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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 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.

September 30, 2025Level 1Level 2Level 3Total
Fair Value
(In thousands)
Financial assets:
Fixed maturity securities:
    
U.S. Treasury and U.S. Government-sponsored enterprises$5,689 1,365 — 7,054 
States and political subdivisions— 267,784 — 267,784 
Corporate43 847,604 — 847,647 
Commercial mortgage-backed— 310 — 310 
Residential mortgage-backed— 97,407 — 97,407 
Asset-backed— 49,843 — 49,843 
Total fixed maturity securities
5,732 1,264,313 — 1,270,045 
Equity securities:    
Bond mutual funds222 — — 222 
Common stocks
1,142 — — 1,142 
Non-redeemable preferred stock7 — — 7 
Total equity securities1,371 — — 1,371 
Other long-term investments (1)
— — — 85,455 
Total financial assets$7,103 1,264,313 — 1,356,871 
(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.
September 30, 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$34,813 — 0$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 growth— — 011,568 — 0
Late-stage growthInvestments in private late-stage, established companies seeking capital to accelerate growth prior to an IPO or sale35,787 2,154 
3 to 5
27,825 8,134 
3 to 5
InfrastructureInvestments in environmental infrastructure and related technology, focusing on renewable power generation and distribution13,817 3,925 
8 to 10
18,575 5,637 
9 to 10
Total limited partnerships$84,417 6,079 $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:

 September 30, 2025December 31, 2024
(In thousands)Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
Financial assets:
    
Policy loans$68,717 68,717 71,216 71,216 
Residential mortgage loan27 26 33 34 
Cash and cash equivalents23,123 23,123 29,271 29,271 
Financial liabilities:
    
Annuity - investment contracts67,714 64,420 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)
September 30, 2025December 31, 2024
Other long-term investments:
Limited partnerships$84,417 93,337 
Structured note
1,038 — 
FHLB common stock219 212 
All other investments
64 55 
Total other long-term investments$85,738 93,604