XML 34 R12.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Madison Gas and Electric Company Consolidated Statements of Common Equity - USD ($) shares in Thousands, $ in Thousands | Total | MGE [Member] | Common Stock [Member] | Common Stock [Member] MGE [Member] | Additional Paid-In Capital [Member] MGE [Member] | Retained Earnings [Member] | Retained Earnings [Member] MGE [Member] | Accumulated Other Comprehensive (Loss)/ Income [Member] | Accumulated Other Comprehensive (Loss)/ Income [Member] MGE [Member] | Noncontrolling Interest [Member] MGE [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance, shares at Dec. 31, 2012 |  |  | 34,668 | 17,348 |  |  |  |  |  |
Beginning balance, value at Dec. 31, 2012 |  | $ 550,766 |  | $ 17,348 | $ 192,417 |  | $ 223,527 |  | $ 4 | $ 117,470
Increase (Decrease) in Common Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income |  | 76,445 |  |  |  |  | 49,007 |  |  | 27,438
Other comprehensive income/(loss) | $ 283 | 188 |  |  |  |  |  | $ 283 | 188 |
Cash dividends paid to parent by MGE | (52,366) | (25,000) |  |  |  |  | (25,000) |  |  |
Equity contribution received by noncontrolling interest |  | 1,420 |  |  |  |  |  |  |  | 1,420
Distributions to parent from noncontrolling interest |  | (27,365) |  |  |  |  |  |  |  | (27,365)
Ending balance, shares at Dec. 31, 2013 |  |  | 34,668 | 17,348 |  |  |  |  |  |
Ending balance, value at Dec. 31, 2013 |  | 576,454 |  | $ 17,348 | 192,417 |  | 247,534 |  | 192 | 118,963
Increase (Decrease) in Common Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income |  | 81,938 |  |  |  |  | 55,628 |  |  | 26,310
Other comprehensive income/(loss) | 81 | (48) |  |  |  |  |  | 81 | (48) |
Cash dividends paid to parent by MGE | (47,859) | (26,500) |  |  |  |  | (26,500) |  |  |
Equity contribution received by noncontrolling interest |  | 1,775 |  |  |  |  |  |  |  | 1,775
Distributions to parent from noncontrolling interest |  | (21,359) |  |  |  |  |  |  |  | (21,359)
Ending balance, shares at Dec. 31, 2014 |  |  | 34,668 | 17,348 |  |  |  |  |  |
Ending balance, value at Dec. 31, 2014 |  | 612,260 |  | $ 17,348 | 192,417 |  | 276,662 |  | 144 | 125,689
Cumulative effect of new accounting principle (See Footnote 1) at Dec. 31, 2014 | (142) | (142) |  |  |  | $ (142) | (142) |  |  |
Beginning balance, value - Adjusted at Dec. 31, 2014 |  | 612,118 |  |  |  |  | 276,520 |  |  |
Increase (Decrease) in Common Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income |  | 71,465 |  |  |  |  | 45,368 |  |  | 26,097
Other comprehensive income/(loss) | (101) | (121) |  |  |  |  |  | $ (101) | (121) |
Cash dividends paid to parent by MGE | $ (44,708) | (30,000) |  |  |  |  | (30,000) |  |  |
Equity contribution received by noncontrolling interest |  | 3,230 |  |  |  |  |  |  |  | 3,230
Distributions to parent from noncontrolling interest |  | (14,708) |  |  |  |  |  |  |  | (14,708)
Ending balance, shares at Dec. 31, 2015 |  |  | 34,668 | 17,348 |  |  |  |  |  |
Ending balance, value at Dec. 31, 2015 |  | $ 641,984 |  | $ 17,348 | $ 192,417 |  | $ 291,888 |  | $ 23 | $ 140,308

X
- Definition Distributions to parent company from noncontrolling interest. + References No definition available. + Details
Name: | mgee_DistributionsToParentFromNoncontrollingInterest
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Contribution by noncontrolling interests that purchase additional shares or otherwise increase their ownership stake in a subsidiary of the entity. + References No definition available. + Details
Name: | mgee_EquityContributionReceivedByNoncontrollingInterest
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.9-06) -URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537971-122884 + Details
Name: | us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_IncreaseDecreaseInStockholdersEquityRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51821188&loc=d3e1436-108581 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: 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 + Details
Name: | us-gaap_ProfitLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
Name: | us-gaap_SharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4590271-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4568447-111683 + Details
Name: | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of stockholders' equity including the portion attributable to noncontrolling interests, after the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AdditionalPaidInCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_RetainedEarningsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_NoncontrollingInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |