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Madison Gas and Electric Company Consolidated Statements of Common Equity (Unaudited) (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 ($) | Retained Earnings [Member] USD ($) | 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, 2013 |  | $ 576,454 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  | $ 17,348 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 192,417 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | $ 247,534 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | $ 192 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 118,963 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Beginning balance, shares at Dec. 31, 2013 |  |  | 34,668 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 17,348 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Increase (Decrease) In Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income |  | 27,643 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  | 21,133 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 6,510 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Other comprehensive income (loss) | 7 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 18 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |  | 7 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 18 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Cash dividends paid to parent by MGE |  | (7,000)us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  | (7,000)us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Equity contribution received by noncontrolling interest |  | 533 mgee_EquityContributionReceivedByNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |  |  |  | 533 mgee_EquityContributionReceivedByNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Distributions to parent from noncontrolling interest |  | (6,909)mgee_DistributionsToParentFromNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |  |  |  | (6,909)mgee_DistributionsToParentFromNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending balance, value at Mar. 31, 2014 |  | 590,739 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  | 17,348 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 192,417 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 261,667 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 210 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 119,097 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending balance, shares at Mar. 31, 2014 |  |  | 34,668 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 17,348 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Beginning balance, value - Adjusted at Dec. 31, 2014 |  | 612,118 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  | 276,520 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1 / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Beginning balance, value at Dec. 31, 2014 |  | 612,260 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  | 17,348 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 192,417 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 276,662 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 144 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 125,689 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Beginning balance, shares at Dec. 31, 2014 |  |  | 34,668 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 17,348 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Cumulative effect of new accounting principle (See Footnote 4) at Dec. 31, 2014 | (142)mgee_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption | (142)mgee_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  | (142)mgee_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (142)mgee_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Increase (Decrease) In Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income |  | 18,311 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  | 11,758 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 6,553 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Other comprehensive income (loss) | (85)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (82)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |  | (85)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (82)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Equity contribution received by noncontrolling interest |  | 2,678 mgee_EquityContributionReceivedByNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |  |  |  | 2,678 mgee_EquityContributionReceivedByNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Distributions to parent from noncontrolling interest |  | (6,818)mgee_DistributionsToParentFromNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |  |  |  | (6,818)mgee_DistributionsToParentFromNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending balance, value at Mar. 31, 2015 |  | $ 626,207 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  | $ 17,348 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 192,417 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | $ 288,278 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | $ 62 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 128,102 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending balance, shares at Mar. 31, 2015 |  |  | 34,668 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 17,348 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |

X
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