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Consolidated Statements of Equity - USD ($)
$ in Thousands
Total
Common Stock
Other Paid-In Capital
Retained Earnings
MDU Resources’ Stock Held by Subsidiary
Treasury Stock
Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2022   80,000          
Beginning balance at Dec. 31, 2022 $ 1,028,589 $ 800 $ 549,106 $ 494,661 $ (3,626) $ 0 $ (12,352)
Common stock held by subsidiary, beginning balance (in shares) at Dec. 31, 2022         (538,921)    
Treasury stock, beginning balance (in shares) at Dec. 31, 2022           0  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 182,872     182,872      
Other comprehensive income (loss) 1,033           1,033
Stock-based compensation 2,851   2,888 (37)      
Common stock issued for board of director fees (in shares)   12,192          
Common stock issued for board of director fees 702   702        
Retirement of historical common stock in connection with the Separation (in shares)   (80,000)          
Retirement of historical common stock in connection with the Separation 0 $ (800) 800        
Issuance of common stock in connection with the Separation (in shares)   56,997,350          
Issuance of common stock in connection with the Separation 0 $ 570 (570)        
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 historical cost (in shares)           (431,136)  
Receipt of treasury stock at historical cost (3,626)         $ (3,626)  
Net transfers from Centennial and MDU Resources including Separation adjustments 62,972   62,972        
Net transfers to Centennial pre-Separation (13,007)   (1,385) (11,622)      
Ending balance (in shares) at Dec. 31, 2023   57,009,542          
Ending balance at Dec. 31, 2023 1,266,012 $ 570 614,513 665,874 $ 0 $ (3,626) (11,319)
Common stock held by subsidiary, ending balance (in shares) at Dec. 31, 2023         0    
Treasury stock, ending balance (in shares) at Dec. 31, 2023           (431,136)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 201,678     201,678      
Other comprehensive income (loss) 2,017           2,017
Stock-based compensation 8,051   8,057 (6)      
Common stock issued for employee compensation, net of tax withholding (in shares)   31,298          
Common stock issued for employee compensation, net of tax withholding $ (1,673)   (1,673)        
Common stock issued for board of director fees (in shares)   3,001          
Ending balance (in shares) at Dec. 31, 2024 56,612,705 57,043,841          
Ending balance at Dec. 31, 2024 $ 1,476,085 $ 570 620,897 867,546 $ 0 $ (3,626) (9,302)
Common stock held by subsidiary, ending balance (in shares) at Dec. 31, 2024         0    
Treasury stock, ending balance (in shares) at Dec. 31, 2024 (431,136)         (431,136)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income $ 157,074     157,074      
Other comprehensive income (loss) (960)           (960)
Stock-based compensation 11,394   11,394        
Common stock issued for employee compensation, net of tax withholding (in shares)   39,656          
Common stock issued for employee compensation, net of tax withholding $ (2,653) $ 1 (2,654)        
Common stock issued for board of director fees (in shares)   11,804          
Ending balance (in shares) at Dec. 31, 2025 56,664,165 57,095,301          
Ending balance at Dec. 31, 2025 $ 1,640,940 $ 571 $ 629,637 $ 1,024,620 $ 0 $ (3,626) $ (10,262)
Common stock held by subsidiary, ending balance (in shares) at Dec. 31, 2025         0    
Treasury stock, ending balance (in shares) at Dec. 31, 2025 (431,136)         (431,136)