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MGE Energy Inc Consolidated Statements of Common Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Beginning balance, shares at Dec. 31, 2021   36,163      
Beginning balance, value at Dec. 31, 2021 $ 1,027,468 $ 36,163 $ 394,903 $ 596,402 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 56,181     56,181  
Common stock dividends declared (28,027)     (28,027)  
Equity-based compensation plans and other 435   435    
Ending balance, shares at Jun. 30, 2022   36,163      
Ending balance, value at Jun. 30, 2022 1,056,057 $ 36,163 395,338 624,556 0
Beginning balance, shares at Mar. 31, 2022   36,163      
Beginning balance, value at Mar. 31, 2022 1,048,153 $ 36,163 395,181 616,809 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 21,761     21,761  
Common stock dividends declared (14,014)     (14,014)  
Equity-based compensation plans and other 157   157    
Ending balance, shares at Jun. 30, 2022   36,163      
Ending balance, value at Jun. 30, 2022 1,056,057 $ 36,163 395,338 624,556 0
Beginning balance, shares at Dec. 31, 2022   36,163      
Beginning balance, value at Dec. 31, 2022 1,081,674 $ 36,163 395,657 649,854 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 59,759     59,759  
Common stock dividends declared (29,473)     (29,473)  
Equity-based compensation plans and other 624   624    
Ending balance, shares at Jun. 30, 2023   36,163      
Ending balance, value at Jun. 30, 2023 1,112,584 $ 36,163 396,281 680,140 0
Beginning balance, shares at Mar. 31, 2023   36,163      
Beginning balance, value at Mar. 31, 2023 1,098,370 $ 36,163 396,011 666,196 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 28,681     28,681  
Common stock dividends declared (14,737)     (14,737)  
Equity-based compensation plans and other 270   270    
Ending balance, shares at Jun. 30, 2023   36,163      
Ending balance, value at Jun. 30, 2023 $ 1,112,584 $ 36,163 $ 396,281 $ 680,140 $ 0