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Fair value measurements (Tables)
 9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Schedule of Available-for-Sale Securities Details of available-for-sale securities were as follows:
September 30, 2025CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$8,465 $24 $230 $8,259 
U.S. Treasury securities3,495 24 3 3,516 
Total$11,960 $48 $233 $11,775 
September 30, 2024CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$8,104 $41 $312 $7,833 
U.S. Treasury securities3,897 74 — 3,971 
Total$12,001 $115 $312 $11,804 
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 $11,578 
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis
The Company's assets measured at fair value on a recurring basis were as follows:
 Fair Value Measurements at September 30, 2025, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at September 30, 2025
(In thousands)
Assets:    
Money market funds$— $9,743 $— $9,743 
Insurance contracts*— 66,229 — 66,229 
Available-for-sale securities:
Mortgage-backed securities— 8,260 — 8,260 
U.S. Treasury securities— 3,516 — 3,516 
Total assets measured at fair value$— $87,748 $— $87,748 
* The insurance contracts invest approximately 57 percent in fixed-income investments, 18 percent in common stock of large-cap companies, 10 percent in target date investments, 7 percent in common stock of mid-cap companies, 4 percent in common stock of small-cap companies, 3 percent in cash equivalents, and 1 percent in international investments.
 Fair Value Measurements at September 30, 2024, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at September 30, 2024
(In thousands)
Assets:    
Money market funds$— $11,033 $— $11,033 
Insurance contracts*— 59,210 — 59,210 
Available-for-sale securities:
Mortgage-backed securities— 7,833 — 7,833 
U.S. Treasury securities— 3,971 — 3,971 
Total assets measured at fair value$— $82,047 $— $82,047 
* The insurance contracts invest approximately 55 percent in fixed-income investments, 18 percent in common stock of large-cap companies, 10 percent in target date investments, 8 percent in common stock of mid-cap companies, 4 percent in common stock of small-cap companies, 4 percent in cash equivalents, and 1 percent in international investments.
 Fair Value Measurements at December 31, 2024, Using 
Quoted Prices in
Active Markets
for Identical
Assets
 (Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2024
(In thousands)
Assets:    
Money market funds$— $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.
Schedule of Fair Value of Long-Term Debt Outstanding The estimated fair value of the Company's Level 2 long-term debt was as follows:
 September 30, 2025September 30, 2024December 31, 2024
(In thousands)
Carrying amount$2,353,185 $2,320,297 $2,292,610 
Fair value$2,068,905 $2,075,359 $1,963,396