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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 (Loss)/Income [Member]
Accumulated Other Comprehensive (Loss)/Income [Member]
MGE [Member]
Noncontrolling Interest [Member]
MGE [Member]
Beginning balance, shares at Dec. 31, 2013     34,668 17,348            
Beginning balance, value at Dec. 31, 2013   $ 576,454   $ 17,348 $ 192,417   $ 247,534   $ 192 $ 118,963
Increase (Decrease) In Stockholders' Equity [Roll Forward]                    
Net Income   41,786         28,655     13,131
Other comprehensive income (loss) $ (39) (98)           $ (39) (98)  
Cash dividends paid to parent by MGE   (16,750)         (16,750)      
Equity contribution received by noncontrolling interest   1,065               1,065
Distributions to parent from noncontrolling interest   (12,838)               (12,838)
Ending balance, shares at Jun. 30, 2014     34,668 17,348            
Ending balance, value at Jun. 30, 2014   589,619   $ 17,348 192,417   259,439   94 120,321
Beginning balance, shares at Dec. 31, 2014     34,668 17,348            
Beginning balance, value at Dec. 31, 2014   612,260   $ 17,348 192,417   276,662   144 125,689
Cumulative effect of new accounting principle (See Footnote 4) at Dec. 31, 2014 (142) (142)       $ (142) (142)      
Beginning balance, value - Adjusted at Dec. 31, 2014   612,118         276,520      
Increase (Decrease) In Stockholders' Equity [Roll Forward]                    
Net Income   31,829         18,650     13,179
Other comprehensive income (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