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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Performance Unit Graded Vesting Schedule |
|  |  | MGE Energy |
| Grant Date |  | Units Granted |
| January 15, 2010 |  | 25,965 |
| January 21, 2011 |  | 23,483 |
| February 17, 2012 |  | 25,040 |
| February 15, 2013 |  | 22,884 |
| February 21, 2014 |  | 21,991 |

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- Definition Tabular disclosure of the share-based compensation units granted by grant date. + References No definition available. + Details
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