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Madison Gas and Electric Company Consolidated Statements of Common Equity (USD $) In Thousands, unless otherwise specified | Total USD ($) | MGE [Member] USD ($) | Common Stock [Member] | Common Stock [Member] MGE [Member] USD ($) | Additional Paid-In Capital [Member] MGE [Member] USD ($) | Retained Earnings [Member] MGE [Member] USD ($) | Accumulated Other Comprehensive (Loss)/ Income [Member] USD ($) | Accumulated Other Comprehensive (Loss)/ Income [Member] MGE [Member] USD ($) | Noncontrolling Interest [Member] MGE [Member] USD ($)
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Beginning balance, value at Dec. 31, 2010 |  | $ 544,309 |  | $ 17,348 | $ 192,417 | $ 192,480 |  | $ 71 | $ 141,993
Beginning balance, shares at Dec. 31, 2010 |  |  | 34,668 | 17,348 |  |  |  |  |
Increase (Decrease) in Common Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net Income |  | 61,252 |  |  |  | 37,282 |  |  | 23,970
Other comprehensive income/(loss) | (30) | (24) |  |  |  |  | (30) | (24) |
Cash dividends paid to parent by MGE | (79,148) | (26,648) |  |  |  | (26,648) |  |  |
Equity contribution received by noncontrolling interest |  | 888 |  |  |  |  |  |  | 888
Distributions to parent from noncontrolling interest |  | (52,500) |  |  |  |  |  |  | (52,500)
Ending balance, value at Dec. 31, 2011 |  | 527,277 |  | 17,348 | 192,417 | 203,114 |  | 47 | 114,351
Ending balance, shares at Dec. 31, 2011 |  |  | 34,668 | 17,348 |  |  |  |  |
Increase (Decrease) in Common Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net Income |  | 65,306 |  |  |  | 40,817 |  |  | 24,489
Other comprehensive income/(loss) | (18) | (43) |  |  |  |  | (18) | (43) |
Cash dividends paid to parent by MGE | (44,343) | (20,404) |  |  |  | (20,404) |  |  |
Equity contribution received by noncontrolling interest |  | 2,130 |  |  |  |  |  |  | 2,130
Distributions to parent from noncontrolling interest |  | (23,500) |  |  |  |  |  |  | (23,500)
Ending balance, value at Dec. 31, 2012 |  | 550,766 |  | 17,348 | 192,417 | 223,527 |  | 4 | 117,470
Ending balance, shares at Dec. 31, 2012 |  |  | 34,668 | 17,348 |  |  |  |  |
Increase (Decrease) in Common Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net Income |  | 76,445 |  |  |  | 49,007 |  |  | 27,438
Other comprehensive income/(loss) | 283 | 188 |  |  |  |  | 283 | 188 |
Cash dividends paid to parent by MGE | (52,366) | (25,000) |  |  |  | (25,000) |  |  |
Equity contribution received by noncontrolling interest |  | 1,420 |  |  |  |  |  |  | 1,420
Distributions to parent from noncontrolling interest |  | (27,365) |  |  |  |  |  |  | (27,365)
Ending balance, value at Dec. 31, 2013 |  | $ 576,454 |  | $ 17,348 | $ 192,417 | $ 247,534 |  | $ 192 | $ 118,963
Ending balance, shares at Dec. 31, 2013 |  |  | 34,668 | 17,348 |  |  |  |  |

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