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Fair value measurements (Tables)
 6 Months Ended
Jun. 30, 2022
Fair Value Disclosures [Abstract]  
Available-for-sale securities Details of available-for-sale securities were as follows:
June 30, 2022CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$8,128 $— $419 $7,709 
U.S. Treasury securities3,125 — 83 3,042 
Total$11,253 $— $502 $10,751 
June 30, 2021CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$8,278 $127 $9 $8,396 
U.S. Treasury securities2,893 — 21 2,872 
Total$11,171 $127 $30 $11,268 
December 31, 2021CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$8,702 $51 $47 $8,706 
U.S. Treasury securities2,407 — 11 2,396 
Total$11,109 $51 $58 $11,102 
Assets and liabilities measured at fair value on a recurring basis
The Company's assets measured at fair value on a recurring basis were as follows:
 Fair Value Measurements at June 30, 2022, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at June 30, 2022
(In thousands)
Assets:    
Money market funds$— $8,333 $— $8,333 
Insurance contracts*— 97,431 — 97,431 
Available-for-sale securities:
Mortgage-backed securities— 7,709 — 7,709 
U.S. Treasury securities— 3,042 — 3,042 
Total assets measured at fair value$— $116,515 $— $116,515 
*    The insurance contracts invest approximately 64 percent in fixed-income investments, 15 percent in common stock of large-cap companies, 7 percent in common stock of mid-cap companies, 6 percent in common stock of small-cap companies, 6 percent in target date investments and 2 percent in cash equivalents.
 Fair Value Measurements at June 30, 2021, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at June 30, 2021
(In thousands)
Assets:    
Money market funds$— $12,234 $— $12,234 
Insurance contracts*— 105,684 — 105,684 
Available-for-sale securities:
Mortgage-backed securities— 8,396 — 8,396 
U.S. Treasury securities— 2,872 — 2,872 
Total assets measured at fair value$— $129,186 $— $129,186 
*    The insurance contracts invest approximately 53 percent in fixed-income investments, 20 percent in common stock of large-cap companies, 10 percent in common stock of mid-cap companies, 9 percent in common stock of small-cap companies, 6 percent in target date investments and 2 percent in cash equivalents.
 Fair Value Measurements at December 31, 2021, Using 
Quoted Prices in
Active Markets
for Identical
Assets
 (Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2021
(In thousands)
Assets:    
Money market funds$— $10,190 $— $10,190 
Insurance contracts*— 109,603 — 109,603 
Available-for-sale securities:
Mortgage-backed securities— 8,706 — 8,706 
U.S. Treasury securities— 2,396 — 2,396 
Total assets measured at fair value$— $130,895 $— $130,895 
*    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, 7 percent in common stock of small-cap companies, 5 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:
 June 30, 2022June 30, 2021December 31, 2021
(In thousands)
Carrying amount$2,927,967 $2,337,049 $2,741,900 
Fair value$2,753,684 $2,616,232 $2,984,866