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Fair value measurements (Tables)
 9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Available-for-Sale Securities Details of available-for-sale securities were as follows:
September 30, 2024CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$8,104 $41 $312 $7,833 
U.S. Treasury securities3,897 74 — 3,971 
Total$12,001 $115 $312 $11,804 
September 30, 2023CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
Mortgage-backed securities$8,386 $— $750 $7,636 
U.S. Treasury securities3,307 11 23 3,295 
Total$11,693 $11 $773 $10,931 
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 $11,322 
Schedule of Assets and liabilities measured at fair value on a recurring basis
The Company's assets measured at fair value on a recurring basis were as follows:
 Fair Value Measurements at September 30, 2024, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at September 30, 2024
(In thousands)
Assets:    
Money market funds$— $11,033 $— $11,033 
Insurance contracts*— 63,658 — 63,658 
Available-for-sale securities:
Mortgage-backed securities— 7,833 — 7,833 
U.S. Treasury securities— 3,971 — 3,971 
Total assets measured at fair value$— $86,495 $— $86,495 
* The insurance contracts invest approximately 55 percent in fixed-income investments, 18 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, 4 percent in cash equivalents, and 1 percent in international investments.
 Fair Value Measurements at September 30, 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 September 30, 2023
(In thousands)
Assets:    
Retained shares in Knife River
$276,213 $— $— $276,213 
Money market funds— 25,818 — 25,818 
Insurance contracts*— 62,736 — 62,736 
Available-for-sale securities:
Mortgage-backed securities— 7,637 — 7,637 
U.S. Treasury securities— 3,295 — 3,295 
Total assets measured at fair value$276,213 $99,486 $— $375,699 
* The insurance contracts invest approximately 50 percent in fixed-income investments, 19 percent in common stock of large-cap companies, 10 percent in target date investments, 10 percent in common stock of mid-cap companies, 6 percent in common stock of small-cap companies,  3 percent in cash equivalents, 1 percent in international investments, and 1 percent in high-yield investments.
 Fair Value Measurements at December 31, 2023, Using 
Quoted Prices in
Active Markets
for Identical
Assets
 (Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2023
(In thousands)
Assets:    
Money market funds$— $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.
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:
 September 30, 2024September 30, 2023December 31, 2023
(In thousands)
Carrying amount$2,452,297 $2,341,147 $2,298,223 
Fair value$2,207,359 $1,960,926 $2,046,039