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Noncontrolling Interest (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
MGE [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Noncontrolling interest on balance sheet |  | $ 140,308 | $ 125,689 |
Net income attributable to noncontrolling interest, net of tax |  | 26,097 | 26,310 | $ 27,438
MGE Transco [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Noncontrolling interest on balance sheet | [1] | 23,592 | 22,397 |
Net income attributable to noncontrolling interest, net of tax | [1] | $ 2,172 | 2,484 | 2,408
MGE Power [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Ownership percentage by parent |  | 100.00% |  |
MGE Power West Campus [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Ownership percentage by parent |  | 100.00% |  |
Noncontrolling interest on balance sheet | [2] | $ 37,603 | 30,755 |
Net income attributable to noncontrolling interest, net of tax | [2] | $ 7,348 | 7,666 | 7,657
MGE Power Elm Road [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Ownership percentage by parent |  | 100.00% |  |
Noncontrolling interest on balance sheet | [2] | $ 79,113 | 72,537 |
Net income attributable to noncontrolling interest, net of tax | [2] | $ 16,577 | $ 16,160 | $ 17,373
[1] | At December 31, 2015 , MGE is the majority owner, and MGE Energy is the minority owner, of MGE Transco. MGE Energy's proportionat e share of the equity and net income of MGE Transco is classified within the MGE consolidated financial statements as noncontrolling interest . In mid-2016, MGE is no longer expected to be the majority owner of MGE Transco. The change will have no effect on MGE Energy' s consolidated financial statements; however, MGE Energy ' s proportionate share of the equity and net income of MGE Transco will be deconsolidated from MGE’s financial statements. No gain or loss is expected to be recognized on the date MGE ceases to have a controlling financial interest .
[2] | MGE Power Elm Road and MGE Power West Campus are not su bsidiaries of MGE; however, they have been consolidated in the consolidated financial statements of MGE (see Footnote 2). MGE Power Elm Road and MGE Power West Campus are 100 % owned by MGE Power , and MGE Power is 100 % owned by MGE Energy. MGE Energy's proportionate share of the equity and net income (through its wholly owned subsidiary MGE Power) of MGE Power Elm Road and MGE Power West Campus is classified within the MGE consolidated financial statements as noncontrolling interest.

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 + Details
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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 + Details
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