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Fair value measurements (Tables)
 3 Months Ended
Mar. 31, 2025
Fair Value Disclosures [Abstract]  
Schedule of Available-for-Sale Securities Details of available-for-sale securities were as follows:
March 31, 2025CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$7,997 $18 $299 $7,716 
U.S. Treasury securities3,869 76 1 3,944 
Total$11,866 $94 $300 $11,660 
March 31, 2024CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$8,072 $4 $507 $7,569 
U.S. Treasury securities3,756 35 2 3,789 
Total$11,828 $39 $509 $11,358 
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 $11,578 
Schedule of Assets and liabilities measured at fair value on a recurring basis
The Company's assets measured at fair value on a recurring basis were as follows:
 Fair Value Measurements at March 31, 2025, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at March 31, 2025
(In thousands)
Assets:    
Money market funds$— $13,841 $— $13,841 
Insurance contracts*— 61,075 — 61,075 
Available-for-sale securities:
Mortgage-backed securities— 7,716 — 7,716 
U.S. Treasury securities— 3,944 — 3,944 
Total assets measured at fair value$— $86,576 $— $86,576 
* The insurance contracts invest approximately 58 percent in fixed-income investments, 17 percent in common stock of large-cap companies, 9 percent in target date investments, 7 percent in common stock of mid-cap companies, 4 percent in common stock of small-cap companies, 3 percent in cash equivalents, 1 percent in international investments, and 1 percent in real estate.
 Fair Value Measurements at March 31, 2024, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at March 31, 2024
(In thousands)
Assets:    
Money market funds$— $6,985 $— $6,985 
Insurance contracts*— 58,760 — 58,760 
Available-for-sale securities:
Mortgage-backed securities— 7,569 — 7,569 
U.S. Treasury securities— 3,789 — 3,789 
Total assets measured at fair value$— $77,103 $— $77,103 
* The insurance contracts invest approximately 57 percent in fixed-income investments, 17 percent in common stock of large-cap companies, 10 percent in target date investments, 8 percent in common stock of mid-cap companies, 4 percent in common stock of small-cap companies, 3 percent in cash equivalents, and 1 percent in international investments.
 Fair Value Measurements at December 31, 2024, Using 
Quoted Prices in
Active Markets
for Identical
Assets
 (Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2024
(In thousands)
Assets:    
Money market funds$— $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:
 March 31, 2025March 31, 2024December 31, 2024
(In thousands)
Carrying amount$2,193,676 $2,254,397 $2,292,610 
Fair value$1,902,217 $1,966,002 $1,963,396