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10-Q Consolidated Statements of Equity - USD ($)
$ in Thousands
Total
Common stock
Other paid-in capital
Retained earnings
MDU Resources' stock held by subsidiary
Accumulated other comprehensive loss
Treasury stock
Common stock balance (in shares) at Dec. 31, 2019   80,000          
Beginning balance at Dec. 31, 2019 $ 778,080 $ 800 $ 548,631 $ 260,729   $ (28,454)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 147,325     147,325      
Other comprehensive income (499)         (499)  
Common stock balance (in shares) at Dec. 31, 2020   80,000          
Ending balance at Dec. 31, 2020 878,244 $ 800 550,262 359,761   (28,953)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 129,755     129,755      
Other comprehensive income $ 4,463         4,463  
Common stock balance (in shares) at Dec. 31, 2021 80,000 80,000          
Ending balance at Dec. 31, 2021 $ 952,844 $ 800 549,714 430,446 $ (3,626) (24,490) $ 0
MDU Resources common stock held by subsidiary at cost (in shares) at Dec. 31, 2021         (538,921)    
Treasury stock (in shares) at Dec. 31, 2021             0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) (40,010)     (40,010)      
Other comprehensive income 303         303  
Stock-based compensation 306   333 (27)      
Equity net transfers to (from) Parent (16,408)   (3,432) (12,976)      
Common stock balance (in shares) at Mar. 31, 2022   80,000          
Ending balance at Mar. 31, 2022 $ 897,035 $ 800 546,615 377,433 $ (3,626) (24,187) $ 0
MDU Resources common stock held by subsidiary at cost (in shares) at Mar. 31, 2022         (538,921)    
Treasury stock (in shares) at Mar. 31, 2022             0
Common stock balance (in shares) at Dec. 31, 2021 80,000 80,000          
Beginning balance at Dec. 31, 2021 $ 952,844 $ 800 549,714 430,446 $ (3,626) (24,490) $ 0
MDU Resources common stock held by subsidiary at cost (in shares) at Dec. 31, 2021         (538,921)    
Treasury stock (in shares) at Dec. 31, 2021             0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) (1,448)            
Other comprehensive income 6,425            
Common stock balance (in shares) at Jun. 30, 2022   80,000          
Ending balance at Jun. 30, 2022 $ 923,988 $ 800 541,885 402,994 $ (3,626) (18,065) $ 0
MDU Resources common stock held by subsidiary at cost (in shares) at Jun. 30, 2022         (538,921)    
Treasury stock (in shares) at Jun. 30, 2022             0
Common stock balance (in shares) at Dec. 31, 2021 80,000 80,000          
Beginning balance at Dec. 31, 2021 $ 952,844 $ 800 549,714 430,446 $ (3,626) (24,490) $ 0
MDU Resources common stock held by subsidiary at cost (in shares) at Dec. 31, 2021         (538,921)    
Treasury stock (in shares) at Dec. 31, 2021             0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 116,220     116,220      
Other comprehensive income $ 12,138         12,138  
Common stock balance (in shares) at Dec. 31, 2022 80,000 80,000          
Ending balance at Dec. 31, 2022 $ 1,028,589 $ 800 549,106 494,661 $ (3,626) (12,352) $ 0
MDU Resources common stock held by subsidiary at cost (in shares) at Dec. 31, 2022 (538,921)       (538,921)    
Treasury stock (in shares) at Dec. 31, 2022             0
Common stock balance (in shares) at Mar. 31, 2022   80,000          
Beginning balance at Mar. 31, 2022 $ 897,035 $ 800 546,615 377,433 $ (3,626) (24,187) $ 0
MDU Resources common stock held by subsidiary at cost (in shares) at Mar. 31, 2022         (538,921)    
Treasury stock (in shares) at Mar. 31, 2022             0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 38,562     38,562      
Other comprehensive income 6,122         6,122  
Stock-based compensation 306   333 (27)      
Equity net transfers to (from) Parent (18,037)   (5,063) (12,974)      
Common stock balance (in shares) at Jun. 30, 2022   80,000          
Ending balance at Jun. 30, 2022 $ 923,988 $ 800 541,885 402,994 $ (3,626) (18,065) $ 0
MDU Resources common stock held by subsidiary at cost (in shares) at Jun. 30, 2022         (538,921)    
Treasury stock (in shares) at Jun. 30, 2022             0
Common stock balance (in shares) at Dec. 31, 2022 80,000 80,000          
Beginning balance at Dec. 31, 2022 $ 1,028,589 $ 800 549,106 494,661 $ (3,626) (12,352) $ 0
MDU Resources common stock held by subsidiary at cost (in shares) at Dec. 31, 2022 (538,921)       (538,921)    
Treasury stock (in shares) at Dec. 31, 2022             0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) $ (41,320)     (41,320)      
Other comprehensive income 93         93  
Stock-based compensation 414   453 (39)      
Equity net transfers to (from) Parent (13,007)   (1,385) (11,622)      
Common stock balance (in shares) at Mar. 31, 2023   80,000          
Ending balance at Mar. 31, 2023 $ 974,769 $ 800 548,174 441,680 $ (3,626) (12,259) $ 0
MDU Resources common stock held by subsidiary at cost (in shares) at Mar. 31, 2023         (538,921)    
Treasury stock (in shares) at Mar. 31, 2023             0
Common stock balance (in shares) at Dec. 31, 2022 80,000 80,000          
Beginning balance at Dec. 31, 2022 $ 1,028,589 $ 800 549,106 494,661 $ (3,626) (12,352) $ 0
MDU Resources common stock held by subsidiary at cost (in shares) at Dec. 31, 2022 (538,921)       (538,921)    
Treasury stock (in shares) at Dec. 31, 2022             0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) $ 15,516            
Other comprehensive income $ 168            
Common stock balance (in shares) at Jun. 30, 2023 56,997,350 56,997,350          
Ending balance at Jun. 30, 2023 $ 1,094,852 $ 570 611,562 498,530 $ 0 (12,184) $ (3,626)
MDU Resources common stock held by subsidiary at cost (in shares) at Jun. 30, 2023         0    
Treasury stock (in shares) at Jun. 30, 2023 (431,136)           (431,136)
Common stock balance (in shares) at Mar. 31, 2023   80,000          
Beginning balance at Mar. 31, 2023 $ 974,769 $ 800 548,174 441,680 $ (3,626) (12,259) $ 0
MDU Resources common stock held by subsidiary at cost (in shares) at Mar. 31, 2023         (538,921)    
Treasury stock (in shares) at Mar. 31, 2023             0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 56,836     56,836      
Other comprehensive income 75         75  
Stock-based compensation 226   212 14      
Transfer of MDU Resources' stock held by subsidiary (in shares)         538,921    
Transfer of MDU Resources' stock held by subsidiary 3,626       $ 3,626    
Receipt of treasury stock at cost (in shares)             (431,136)
Receipt of treasury stock at cost (3,626)           $ (3,626)
Retirement of historical common stock in connection with the Spin-Off (in shares)   (80,000)          
Retirement of historical common stock in connection with the Spin-Off 0 $ 800 800        
Issuance of common stock in connection with the Spin-Off (in shares)   56,997,350          
Issuance of common stock in connection with the Spin-Off (26) $ 570 (596)        
Equity net transfers to (from) Parent $ 62,972   62,972        
Common stock balance (in shares) at Jun. 30, 2023 56,997,350 56,997,350          
Ending balance at Jun. 30, 2023 $ 1,094,852 $ 570 $ 611,562 $ 498,530 $ 0 $ (12,184) $ (3,626)
MDU Resources common stock held by subsidiary at cost (in shares) at Jun. 30, 2023         0    
Treasury stock (in shares) at Jun. 30, 2023 (431,136)           (431,136)