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Investments (Details-2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 MGE Transco [Member] ATC [Member] | Dec. 31, 2012 MGE Transco [Member] ATC [Member] | Dec. 31, 2011 MGE Transco [Member] ATC [Member] | Jan. 31, 2014 MGE Transco [Member] ATC [Member] Subsequent Event [Member]
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity in earnings in ATC | $ 9,434 | $ 9,079 | $ 8,615 | $ 9,400 | $ 9,100 | $ 8,600 |
Dividend income from ATC | 7,404 | 7,146 | 6,728 | 7,400 | 7,100 | 6,700 |
Contributions to investments | $ 1,660 | $ 2,419 | $ 1,008 | $ 1,400 | $ 2,100 | $ 900 | $ 500
MGE Transco ownership interest in ATC |  |  |  | 3.60% | 3.60% |  |

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