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MGE Energy Inc Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Operating Revenues: |  |
Regulated electric revenues | $ 98,240 us-gaap_ElectricDomesticRegulatedRevenue | $ 98,852 us-gaap_ElectricDomesticRegulatedRevenue
Regulated gas revenues | 69,928 us-gaap_GasDomesticRegulatedRevenue | 110,713 us-gaap_GasDomesticRegulatedRevenue
Nonregulated revenues | 1,966 us-gaap_UnregulatedOperatingRevenue | 680 us-gaap_UnregulatedOperatingRevenue
Total Operating Revenues | 170,134 us-gaap_RegulatedAndUnregulatedOperatingRevenue | 210,245 us-gaap_RegulatedAndUnregulatedOperatingRevenue
Operating Expenses: |  |
Fuel for electric generation | 11,892 us-gaap_UtilitiesOperatingExpenseFuelUsed | 14,132 us-gaap_UtilitiesOperatingExpenseFuelUsed
Purchased power | 22,865 us-gaap_UtilitiesOperatingExpensePurchasedPower | 18,555 us-gaap_UtilitiesOperatingExpensePurchasedPower
Cost of gas sold | 46,919 mgee_UtilitiesOperatingExpenseCostOfGasSold | 78,508 mgee_UtilitiesOperatingExpenseCostOfGasSold
Other operations and maintenance | 40,674 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations | 40,472 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations
Depreciation and amortization | 10,849 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization | 9,746 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
Other general taxes | 5,084 us-gaap_UtilitiesOperatingExpenseTaxes | 4,861 us-gaap_UtilitiesOperatingExpenseTaxes
Total Operating Expenses | 138,283 us-gaap_UtilitiesOperatingExpense | 166,274 us-gaap_UtilitiesOperatingExpense
Operating Income | 31,851 us-gaap_OperatingIncomeLoss | 43,971 us-gaap_OperatingIncomeLoss
Other income, net | 2,105 us-gaap_NonoperatingIncomeExpense | 4,552 us-gaap_NonoperatingIncomeExpense
Interest expense, net | (5,091)us-gaap_InterestIncomeExpenseNet | (4,541)us-gaap_InterestIncomeExpenseNet
Income before income taxes | 28,865 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | 43,982 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Income tax provision | (10,587)us-gaap_IncomeTaxExpenseBenefit | (16,265)us-gaap_IncomeTaxExpenseBenefit
Net Income (Loss) | $ 18,278 us-gaap_NetIncomeLoss | $ 27,717 us-gaap_NetIncomeLoss
Earnings Per Share of Common Stock (basic and diluted) | $ 0.53 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.80 us-gaap_EarningsPerShareBasicAndDiluted
Dividends per share of common stock | $ 0.283 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.272 us-gaap_CommonStockDividendsPerShareCashPaid
Weighted Average Shares Outstanding (basic and diluted) | 34,668 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 34,668 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted

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