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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 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 measured at fair value on a recurring basis as of the dates indicated.

September 30, 2024Level 1Level 2Level 3Total
Fair Value
(In thousands)
Financial assets:
Fixed maturity securities, available-for-sale:
    
U.S. Treasury and U.S. Government-sponsored enterprises$6,086 3,667 — 9,753 
States and political subdivisions— 278,213 — 278,213 
Corporate47 832,577 — 832,624 
Commercial mortgage-backed— 267 — 267 
Residential mortgage-backed— 99,197 — 99,197 
Asset-backed— 53,443 — 53,443 
Total fixed maturity securities, available-for-sale
6,133 1,267,364 — 1,273,497 
Equity securities:    
Bond mutual funds766 — — 766 
Common stocks
774 — — 774 
Non-redeemable preferred stock8 — — 8 
Non-redeemable preferred stock fund4,168 — — 4,168 
Total equity securities5,716 — — 5,716 
Other long-term investments (1)
— — — 93,167 
Total financial assets$11,849 1,267,364 — 1,372,380 
(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, 2023Level 1Level 2Level 3Total
Fair Value
(In thousands)
Financial assets:
Fixed maturity securities, available-for-sale:
    
U.S. Treasury and U.S. Government-sponsored enterprises$6,062 3,653 — 9,715 
States and political subdivisions— 287,231 — 287,231 
Corporate43 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, available-for-sale
6,105 1,232,876 — 1,238,981 
Equity securities:    
Bond mutual funds740 — — 740 
Common stocks
665 — — 665 
Non-redeemable preferred stock7 — — 7 
Non-redeemable preferred stock fund3,870 — — 3,870 
Total equity securities5,282 — — 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 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, 2024December 31, 2023
(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$34,832 1,669 3$34,858 3,452 4
Global equity fundInvestments in common stocks of U.S., international developed and emerging markets with a focus on long-term capital growth11,908 — 010,345 — 0
Late-stage growthInvestments in private late-stage, established companies seeking capital to accelerate growth prior to an IPO or sale25,431 10,102 
4 to 6
20,524 14,271 
4 to 6
InfrastructureInvestments in environmental infrastructure and related technology, focusing on renewable power generation and distribution20,996 6,345 
9 to 11
16,733 9,576 10
Total limited partnerships$93,167 18,116 $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:

 September 30, 2024December 31, 2023
(In thousands)Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
Financial assets:
    
Policy loans$72,463 72,463 75,359 75,359 
Residential mortgage loan35 36 42 42 
Cash and cash equivalents32,382 32,382 26,997 26,997 
Financial liabilities:
    
Annuity - investment contracts68,077 63,468 67,690 63,283 
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, 2024December 31, 2023
Other long-term investments:
Limited partnerships$93,167 82,460 
FHLB common stock210 202 
Mortgage loans35 42 
All other investments21 21 
Total other long-term investments$93,433 82,725