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10-Q Cash flow information (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Supplemental Cash Flow Information [Abstract]          
Interest, net $ 24,802 $ 10,721 $ 28,148 $ 19,121 $ 14,805
Income taxes paid, net 558 16,470 21,186 34,784 41,050
Right-of-use assets obtained in exchange for new operating lease liabilities 7,552 4,758 11,763 11,497 22,428
Property, plant and equipment additions in accounts payable 3,359 5,785 $ 13,965 $ 15,840 $ 7,762
Proceeds from Contributions from Parent 64,724 0      
Equity contribution to MDU Resources for asset/liability transfers related to the Separation (1,548) 0      
MDU Resources' stock issued prior to spin in connection with a business combination $ 383 $ 0