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MGE Energy Inc Consolidated Statements of Common Equity (Unaudited) (USD $) In Thousands, unless otherwise specified | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member]
--- | --- | --- | --- | --- | ---
Beginning balance, value at Dec. 31, 2013 | $ 617,510 us-gaap_StockholdersEquity | $ 34,668 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 316,268 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 266,197 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 377 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Beginning balance, shares at Dec. 31, 2013 |  | 34,668 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Increase (Decrease) In Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | 27,717 us-gaap_NetIncomeLoss |  |  | 27,717 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive income (loss) | 7 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 7 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Common stock dividends declared | (9,420)us-gaap_DividendsCommonStockCash |  |  | (9,420)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Cash in lieu of fractional shares related to stock split | (80)mgee_StockholdersEquityValueCashInLieuOfFractionalSharesRelatedToStockSplit |  |  | (80)mgee_StockholdersEquityValueCashInLieuOfFractionalSharesRelatedToStockSplit / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Ending balance, value at Mar. 31, 2014 | 635,734 us-gaap_StockholdersEquity | 34,668 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 316,268 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 284,414 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 384 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance, shares at Mar. 31, 2014 |  | 34,668 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Beginning balance, value at Dec. 31, 2014 | 659,401 us-gaap_StockholdersEquity | 34,668 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 316,268 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 308,007 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 458 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Beginning balance, shares at Dec. 31, 2014 |  | 34,668 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Beginning balance, value - Adjusted at Dec. 31, 2014 | 659,259 mgee_StockholdersEquityAdjustedBalance |  |  | 307,865 mgee_StockholdersEquityAdjustedBalance / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Cumulative effect of new accounting principle (See Footnote 4) at Dec. 31, 2014 | (142)mgee_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption |  |  | (142)mgee_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Increase (Decrease) In Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | 18,278 us-gaap_NetIncomeLoss |  |  | 18,278 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive income (loss) | (85)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | (85)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Common stock dividends declared | (9,794)us-gaap_DividendsCommonStockCash |  |  | (9,794)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Ending balance, value at Mar. 31, 2015 | $ 667,658 us-gaap_StockholdersEquity | $ 34,668 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 316,268 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 316,349 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 373 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance, shares at Mar. 31, 2015 |  | 34,668 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |

X
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