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Fair value measurements (Tables)
 3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Available-for-sale securities Details of available-for-sale securities were as follows:
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 
March 31, 2023CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$8,557 $3 $561 $7,999 
U.S. Treasury securities3,023 8 51 2,980 
Total$11,580 $11 $612 $10,979 
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 $11,322 
Assets and liabilities measured at fair value on a recurring basis
The Company's assets measured at fair value on a recurring basis were as follows:
 Fair Value Measurements at March 31, 2024, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at March 31, 2024
(In thousands)
Assets:    
Money market funds$— $6,985 — $6,985 
Insurance contracts*— 62,713 — 62,713 
Available-for-sale securities:
Mortgage-backed securities— 7,569 — 7,569 
U.S. Treasury securities— 3,789 — 3,789 
Total assets measured at fair value$— $81,056 $— $81,056 
* The insurance contracts invest approximately 57 percent in fixed-income investments, 17 percent in common stock of large-cap companies, 10 percent in target date investments, 8 percent in common stock of mid-cap companies, 4 percent in common stock of small-cap companies, 3 percent in cash equivalents, and 1 percent in international investments.
 Fair Value Measurements at March 31, 2023, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at March 31, 2023
(In thousands)
Assets:    
Money market funds$— $5,447 $— $5,447 
Insurance contracts*— 83,460 — 83,460 
Available-for-sale securities:
Mortgage-backed securities— 7,999 — 7,999 
U.S. Treasury securities— 2,980 — 2,980 
Total assets measured at fair value$— $99,886 $— $99,886 
* The insurance contracts invest approximately 61 percent in fixed-income investments, 15 percent in common stock of large-cap companies, 8 percent in common stock of mid-cap companies, 7 in target date investments, 6 percent in common stock of small-cap companies, 2 percent in cash equivalents and 1 percent in international investments.
 Fair Value Measurements at December 31, 2023, Using 
Quoted Prices in
Active Markets
for Identical
Assets
 (Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2023
(In thousands)
Assets:    
Money market funds$— $6,409 $— $6,409 
Insurance contracts*— 66,283 — 66,283 
Available-for-sale securities:
Mortgage-backed securities— 7,781 — 7,781 
U.S. Treasury securities— 3,541 — 3,541 
Total assets measured at fair value$— $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 of long term debt outstanding The estimated fair value of the Company's Level 2 long-term debt was as follows:
 March 31, 2024March 31, 2023December 31, 2023
(In thousands)
Carrying amount$2,386,397 $2,239,718 $2,298,223 
Fair value$2,098,002 $1,974,344 $2,046,039