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Investment in ATC (Details-2) (ATC [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
ATC [Member] |  |
Schedule Of Equity Method Investments [Line Items] |  |
Operating revenues | $ 152,357 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvesteeMember | $ 163,337 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvesteeMember
Operating expenses | (79,951)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCostOfSales / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvesteeMember | (78,623)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCostOfSales / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvesteeMember
Other income, net | 62 mgee_EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvesteeMember | 388 mgee_EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvesteeMember
Interest expense, net | (24,483)mgee_EquityMethodInvestmentSummarizedFinancialInformationInterestIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvesteeMember | (21,996)mgee_EquityMethodInvestmentSummarizedFinancialInformationInterestIncomeExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvesteeMember
Earnings before members' income taxes | $ 47,985 mgee_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLossBeforeTaxes / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvesteeMember | $ 63,106 mgee_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLossBeforeTaxes / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_EquityMethodInvesteeMember

X
- Definition The amount of interest reported by an equity method investment of the entity. + References No definition available. + Details
Name: | mgee_EquityMethodInvestmentSummarizedFinancialInformationInterestIncomeExpense
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of net income or net loss before taxes reported by an equity method investment of the entity. + References No definition available. + Details
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Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of other income or expenses reported by an equity method investment of the entity. + References No definition available. + Details
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Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of the cost of sales reported by an equity method investment of the entity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity. + References No definition available. + Details
Name: | us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration