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10-Q Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
Jun. 30, 2023
May 31, 2023
May 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]                    
Common stock balance (in shares) 56,997,350 56,997,350     80,000     80,000    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01     $ 10     $ 10    
Common stock held by subsidiary (in shares)     538,921   538,921          
Treasury stock held at cost (in shares) 431,136                  
Equity $ 1,094,852     $ 974,769 $ 1,028,589 $ 923,988 $ 897,035 $ 952,844 $ 878,244 $ 778,080
MDU Resources' Common Stock Held by Subsidiary                    
Class of Stock [Line Items]                    
Equity $ 3,600