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Quarterly Summary of Operations (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Summary of Operations |
| (In thousands, except per share amounts) |  | Quarters Ended |
| 2015 |  | March 31 |  | June 30 |  | September 30 |  | December 31 |
| Operating revenues: |  |  |  |  |  |  |  |  |
| Regulated electric revenues | $ | 98,240 |  | 99,481 |  | 121,453 | $ | 93,354 |
| Regulated gas revenues |  | 69,928 |  | 20,669 |  | 17,431 |  | 35,709 |
| Nonregulated revenues |  | 1,966 |  | 1,976 |  | 1,911 |  | 1,910 |
| Total Operating Revenues |  | 170,134 |  | 122,126 |  | 140,795 |  | 130,973 |
| Operating expenses |  | 138,283 |  | 98,077 |  | 94,618 |  | 108,795 |
| Operating income |  | 31,851 |  | 24,049 |  | 46,177 |  | 22,178 |
| Interest and other income, net |  | (2,986) |  | (2,562) |  | (2,472) |  | (3,529) |
| Income tax provision |  | (10,587) |  | (8,008) |  | (15,351) |  | (7,417) |
| Earnings on common stock | $ | 18,278 | $ | 13,479 | $ | 28,354 | $ | 11,232 |
| Earnings per common share | $ | 0.53 | $ | 0.39 | $ | 0.82 | $ | 0.32 |
| Dividends per share | $ | 0.283 | $ | 0.283 | $ | 0.295 | $ | 0.295 |
| 2014 |  |  |  |  |  |  |  |  |
| Operating revenues: |  |  |  |  |  |  |  |  |
| Regulated electric revenues | $ | 98,852 | $ | 96,697 | $ | 112,869 | $ | 86,431 |
| Regulated gas revenues |  | 110,713 |  | 31,218 |  | 21,404 |  | 58,385 |
| Nonregulated revenues |  | 680 |  | 850 |  | 862 |  | 891 |
| Total Operating Revenues |  | 210,245 |  | 128,765 |  | 135,135 |  | 145,707 |
| Operating expenses |  | 166,274 |  | 104,324 |  | 95,015 |  | 116,141 |
| Operating income |  | 43,971 |  | 24,441 |  | 40,120 |  | 29,566 |
| Interest and other income, net |  | 11 |  | (1,320) |  | (2,505) |  | (5,780) |
| Income tax provision |  | (16,265) |  | (9,034) |  | (14,286) |  | (8,600) |
| Earnings on common stock | $ | 27,717 | $ | 14,087 | $ | 23,329 | $ | 15,186 |
| Earnings per common share | $ | 0.80 | $ | 0.41 | $ | 0.67 | $ | 0.44 |
| Dividends per share | $ | 0.272 | $ | 0.272 | $ | 0.283 | $ | 0.283 |
Notes: • The quarterly results of operations within a year may not be comparable because of seasonal and other factors. • The sum of earnings per share of common stock for any four quarters may vary slightly from the earnings per share of common stock for the equivalent twelve-month period due to rounding. • MGE Energy's operations are based primarily on its utility subsidiary MGE.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 + Details
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