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Madison Gas and Electric Company Consolidated Statements of Common Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
MGE [Member]
Common Stock [Member]
Common Stock [Member]
MGE [Member]
Additional Paid-In Capital [Member]
MGE [Member]
Retained Earnings [Member]
Retained Earnings [Member]
MGE [Member]
Accumulated Other Comprehensive Income/(Loss) [Member]
Accumulated Other Comprehensive Income/(Loss) [Member]
MGE [Member]
Noncontrolling Interest [Member]
MGE [Member]
Beginning balance, shares at Dec. 31, 2014     34,668 17,348            
Beginning balance, value before adjustments at Dec. 31, 2014   $ 612,260         $ 276,662      
Cumulative effect of new accounting principle at Dec. 31, 2014 $ (142) (142)       $ (142) (142)      
Beginning balance, value at Dec. 31, 2014   612,118   $ 17,348 $ 192,417   276,520   $ 144 $ 125,689
Increase (Decrease) In Stockholders' Equity [Roll Forward]                    
Net Income   31,829         18,650     13,179
Other comprehensive loss (95) (109)           $ (95) (109)  
Cash dividends paid to parent by MGE   (10,000)         (10,000)      
Equity contribution received by noncontrolling interest   2,875               2,875
Distributions to parent from noncontrolling interest   (10,084)               (10,084)
Ending balance, shares at Jun. 30, 2015     34,668 17,348            
Ending balance, value at Jun. 30, 2015   626,629   $ 17,348 192,417   285,170   35 131,659
Beginning balance, shares at Dec. 31, 2015     34,668 17,348            
Beginning balance, value at Dec. 31, 2015   641,984   $ 17,348 192,417   291,888   23 140,308
Increase (Decrease) In Stockholders' Equity [Roll Forward]                    
Net Income   33,287         21,083     12,204
Other comprehensive loss $ (154) (39)           $ (154) (39)  
Cash dividends paid to parent by MGE   (25,000)         (25,000)      
Equity contribution received by noncontrolling interest   710               710
Distributions to parent from noncontrolling interest   (10,552)               (10,552)
Ending balance, shares at Jun. 30, 2016     34,668 17,348            
Ending balance, value at Jun. 30, 2016   $ 640,390   $ 17,348 $ 192,417   $ 287,971   $ (16) $ 142,670