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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Debt Securities, Available-for-sale Details of available-for-sale securities were as follows:
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 
December 31, 2022CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$8,928 $2 $636 $8,294 
U.S. Treasury securities2,608 — 72 2,536 
Total$11,536 $2 $708 $10,830 
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, 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 $— $6,409 
Insurance contracts*— 66,283 — 66,283 
Available-for-sale securities:
Mortgage-backed securities— 7,781 — 7,781 
U.S. Treasury securities— 3,541 — 3,541 
Total assets measured at fair value$— $84,014 $— $84,014 
*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.
 
Fair Value Measurements at December 31, 2022, 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, 2022
 (In thousands)
Assets:    
Money market funds$— $4,913 $— $4,913 
Insurance contracts*— 77,958 — 77,958 
Available-for-sale securities:
Mortgage-backed securities— 8,294 — 8,294 
U.S. Treasury securities— 2,536 — 2,536 
Total assets measured at fair value$— $93,701 $— $93,701 
*The insurance contracts invest approximately 63 percent in fixed-income investments, 15 percent in common stock of large-cap companies, 8 percent in common stock of mid-cap companies, 6 percent in common stock of small-cap companies, 6 percent in target date investments and 2 percent in cash equivalents.
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:
 20232022
 (In thousands)
Carrying Amount$2,298,223 $2,365,667 
Fair Value$2,046,039 $2,053,396