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Fair value measurements (Tables)
 9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Available-for-sale securities Details of available-for-sale securities were as follows:
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 
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 
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 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:    
Investment in Knife River276,213 $— $— $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 $— $375,699 
*    The insurance contracts invest approximately 50 percent in fixed-income investments, 19 percent in common stock of large-cap companies, 10 percent in target date investments, 10 percent in common stock of mid-cap companies, 6 percent in common stock of small-cap companies, 3 percent in cash equivalents, 1 percent in international investments, and 1 percent in high-yield investments.
 Fair Value Measurements at September 30, 2022, Using 
 Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Balance at September 30, 2022
(In thousands)
Assets:    
Money market funds$— $4,878 $— $4,878 
Insurance contracts*— 75,723 — 75,723 
Available-for-sale securities:
Mortgage-backed securities— 7,703 — 7,703 
U.S. Treasury securities— 2,386 — 2,386 
Total assets measured at fair value$— $90,690 $— $90,690 
*    The insurance contracts invest approximately 65 percent in fixed-income investments, 14 percent in common stock of large-cap companies, 7 percent in common stock of mid-cap companies, 6 percent in common stock of small-cap companies, 6 percent in target date investments and 2 percent in cash equivalents.
 Fair Value Measurements at December 31, 2022, Using 
Quoted Prices in
Active Markets
for Identical
Assets
 (Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
 (Level 3)		Balance at December 31, 2022
(In thousands)
Assets:    
Money market funds$— $4,913 $— $4,913 
Insurance contracts*— 77,958 — 77,958 
Available-for-sale securities:
Mortgage-backed securities— 8,294 — 8,294 
U.S. Treasury securities— 2,536 — 2,536 
Total assets measured at fair value$— $93,701 $— $93,701 
*    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:
 September 30, 2023September 30, 2022December 31, 2022
(In thousands)
Carrying amount$2,341,147 $2,278,730 $2,365,667 
Fair value$1,960,926 $1,989,362 $2,053,396