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MGE Energy Inc Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Comprehensive Income [Abstract]    
Net Income $ 18,278us-gaap_NetIncomeLoss $ 27,717us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax:    
Unrealized (loss) gain on available-for-sale securities, net of tax (85)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 7us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Comprehensive Income $ 18,193us-gaap_ComprehensiveIncomeNetOfTax $ 27,724us-gaap_ComprehensiveIncomeNetOfTax