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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2024
Fair Value Disclosures [Abstract]  
Schedule of Debt Securities, Available-for-sale Details of available-for-sale securities were as follows:
December 31, 2024CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$7,933 $4 $383 $7,554 
U.S. Treasury securities3,945 80 1 4,024 
Total$11,878 $84 $384 $11,578 
December 31, 2023CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$8,234 $17 $470 $7,781 
U.S. Treasury securities3,521 28 8 3,541 
Total$11,755 $45 $478 $11,322 
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The Company's assets measured at fair value on a recurring basis were as follows:
 
Fair Value Measurements at December 31, 2024, Using
 
 Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2024
 (In thousands)
Assets:    
Money market funds$— $12,879 $— $12,879 
Insurance contracts*— 59,282 — 59,282 
Available-for-sale securities:
Mortgage-backed securities— 7,554 — 7,554 
U.S. Treasury securities— 4,024 — 4,024 
Total assets measured at fair value$— $83,739 $— $83,739 
*The insurance contracts invest approximately 58 percent in fixed-income investments, 17 percent in common stock of large-cap companies, 8 percent in target date investments, 8 percent in common stock of mid-cap companies, 4 percent in common stock of small-cap companies, 4 percent in cash equivalents, and 1 percent in international investments.
 
Fair Value Measurements at December 31, 2023, Using
 
 Quoted Prices
in Active
Markets for
Identical
Assets
 (Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2023
 (In thousands)
Assets:    
Money market funds$— $6,409 $— $6,409 
Insurance contracts*— 62,936 — 62,936 
Available-for-sale securities:
Mortgage-backed securities— 7,781 — 7,781 
U.S. Treasury securities— 3,541 — 3,541 
Total assets measured at fair value$— $80,667 $— $80,667 
*The insurance contracts invest approximately 60 percent in fixed-income investments, 15 percent in common stock of large-cap companies, 8 percent in target date investments, 7 percent in common stock of mid-cap companies, 5 percent in common stock of small-cap companies, 3 percent in cash equivalents, 1 percent in high yield investments, and 1 percent in international investments.
Schedule of Fair Value, by Balance Sheet Grouping The estimated fair value of the Company's Level 2 long-term debt at December 31 was as follows:
 20242023
 (In thousands)
Carrying Amount$2,292,610 $2,166,223 
Fair Value$1,963,396 $1,914,039