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Fair value measurements (Tables)
 9 Months Ended
Sep. 30, 2022
Fair Value Disclosures [Abstract]  
Available-for-sale securities Details of available-for-sale securities were as follows:
September 30, 2022CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$8,486 $— $783 $7,703 
U.S. Treasury securities2,468 — 82 2,386 
Total$10,954 $— $865 $10,089 
September 30, 2021CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$8,597 $93 $11 $8,679 
U.S. Treasury securities2,681 — 28 2,653 
Total$11,278 $93 $39 $11,332 
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 $11,102 
Assets and liabilities measured at fair value on a recurring basis
The Company's assets measured at fair value on a recurring basis were as follows:
 Fair Value Measurements at September 30, 2022, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at September 30, 2022
(In thousands)
Assets:    
Money market funds$— $7,309 $— $7,309 
Insurance contracts*— 95,170 — 95,170 
Available-for-sale securities:
Mortgage-backed securities— 7,703 — 7,703 
U.S. Treasury securities— 2,386 — 2,386 
Total assets measured at fair value$— $112,568 $— $112,568 
*    The insurance contracts invest approximately 65 percent in fixed-income investments, 14 percent in common stock of large-cap companies, 7 percent in common stock of mid-cap companies, 6 percent in common stock of small-cap companies, 6 percent in target date investments and 2 percent in cash equivalents.
 Fair Value Measurements at September 30, 2021, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at September 30, 2021
(In thousands)
Assets:    
Money market funds$— $9,907 $— $9,907 
Insurance contracts*— 106,371 — 106,371 
Available-for-sale securities:
Mortgage-backed securities— 8,679 — 8,679 
U.S. Treasury securities— 2,653 — 2,653 
Total assets measured at fair value$— $127,610 $— $127,610 
*    The insurance contracts invest approximately 63 percent in fixed-income investments, 16 percent in common stock of large-cap companies, 8 percent in common stock of mid-cap companies, 7 percent in common stock of small-cap companies, 5 percent in target date investments and 1 percent in cash equivalents.
 Fair Value Measurements at December 31, 2021, Using 
Quoted Prices in
Active Markets
for Identical
Assets
 (Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2021
(In thousands)
Assets:    
Money market funds$— $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:
 September 30, 2022September 30, 2021December 31, 2021
(In thousands)
Carrying amount$2,988,452 $2,328,266 $2,741,900 
Fair value$2,647,387 $2,599,907 $2,984,866