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Derivative and Hedging Instruments (Details-3) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Offsetting Liabilities [Line Items] |  |
Collateral posted against derivative positions | $ (600)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset | $ (2,200)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset
Commodity Derivative Contracts [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts | 937 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | 2,433 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Gross amounts offset in balance sheet | (343)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | (223)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Collateral posted against derivative positions | (565)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | (2,179)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Net amount presented in balance sheet | 29 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | 31 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Purchased Power Agreement [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts | 53,410 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = mgee_PurchasedPowerAgreementMember | 53,430 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = mgee_PurchasedPowerAgreementMember
Gross amounts offset in balance sheet | 0 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = mgee_PurchasedPowerAgreementMember | 0 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = mgee_PurchasedPowerAgreementMember
Collateral posted against derivative positions | 0 us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset / us-gaap_DerivativeInstrumentRiskAxis = mgee_PurchasedPowerAgreementMember | 0 us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset / us-gaap_DerivativeInstrumentRiskAxis = mgee_PurchasedPowerAgreementMember
Net amount presented in balance sheet | $ 53,410 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = mgee_PurchasedPowerAgreementMember | $ 53,430 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = mgee_PurchasedPowerAgreementMember

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- Definition Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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- Definition Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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