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Fair value measurements (Tables)
 3 Months Ended
Mar. 31, 2023
Fair Value Disclosures [Abstract]  
Available-for-sale securities Details of available-for-sale securities were as follows:
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 
March 31, 2022CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$8,778 $3 $310 $8,471 
U.S. Treasury securities2,688 — 63 2,625 
Total$11,466 $3 $373 $11,096 
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 $10,830 
Assets and liabilities measured at fair value on a recurring basis
The Company's assets measured at fair value on a recurring basis were as follows:
 Fair Value Measurements at March 31, 2023, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at March 31, 2023
(In thousands)
Assets:    
Money market funds$— $7,919 $— $7,919 
Insurance contracts*— 105,857 — 105,857 
Available-for-sale securities:
Mortgage-backed securities— 7,999 — 7,999 
U.S. Treasury securities— 2,980 — 2,980 
Total assets measured at fair value$— $124,755 $— $124,755 
*    The insurance contracts invest approximately 61 percent in fixed-income investments, 15 percent in common stock of large-cap companies, 8 percent in common stock of mid-cap companies, 7 percent in target date investments, 6 percent in common stock of small-cap companies, 2 percent in cash equivalents and 1 percent in international investments.
 Fair Value Measurements at March 31, 2022, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at March 31, 2022
(In thousands)
Assets:    
Money market funds$— $13,131 $— $13,131 
Insurance contracts*— 105,371 — 105,371 
Available-for-sale securities:
Mortgage-backed securities— 8,471 — 8,471 
U.S. Treasury securities— 2,625 — 2,625 
Total assets measured at fair value$— $129,598 $— $129,598 
*    The insurance contracts invest approximately 61 percent in fixed-income investments, 17 percent in common stock of large-cap companies, 8 percent in common stock of mid-cap companies, 6 percent in common stock of small-cap companies, 6 percent in target date investments and 2 percent in cash equivalents.
 Fair Value Measurements at December 31, 2022, Using 
Quoted Prices in
Active Markets
for Identical
Assets
 (Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2022
(In thousands)
Assets:    
Money market funds$— $7,361 $— $7,361 
Insurance contracts*— 98,041 — 98,041 
Available-for-sale securities:
Mortgage-backed securities— 8,294 — 8,294 
U.S. Treasury securities— 2,536 — 2,536 
Total assets measured at fair value$— $116,232 $— $116,232 
*    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 of long term debt outstanding The estimated fair value of the Company's Level 2 long-term debt was as follows:
 March 31, 2023March 31, 2022December 31, 2022
(In thousands)
Carrying amount$2,847,068 $2,747,763 $2,841,425 
Fair value$2,535,125 $2,755,041 $2,469,625