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MGE Energy Inc Consolidated Statements of Common Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive (Loss)/ Income [Member]
Beginning balance, shares at Dec. 31, 2015   34,668      
Beginning balance, value at Dec. 31, 2015 $ 690,458 $ 34,668 $ 316,268 $ 339,165 $ 357
Increase (Decrease) in Equity [Roll Forward]          
Net Income 75,560     75,560  
Other comprehensive income (loss) (155)       (155)
Common stock dividends declared (41,775)     (41,775)  
Ending balance, shares at Dec. 31, 2016   34,668      
Ending balance, value at Dec. 31, 2016 724,088 $ 34,668 316,268 372,950 202
Increase (Decrease) in Equity [Roll Forward]          
Net Income 97,606     97,606  
Other comprehensive income (loss) 175       175
Common stock dividends declared (43,682)     (43,682)  
Ending balance, shares at Dec. 31, 2017   34,668      
Ending balance, value at Dec. 31, 2017 778,187 $ 34,668 316,268 426,874 377
Increase (Decrease) in Equity [Roll Forward]          
Cumulative effect of new accounting principle 0     377 (377)
Beginning balance, value - Adjusted at Dec. 31, 2017 778,187     427,251 0
Increase (Decrease) in Equity [Roll Forward]          
Net Income 84,219     84,219  
Common stock dividends declared (45,762)     (45,762)  
Ending balance, shares at Dec. 31, 2018   34,668      
Ending balance, value at Dec. 31, 2018 $ 816,644 $ 34,668 $ 316,268 $ 465,708 $ 0