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Quarterly Summary of Operations | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Summary of Operations | Quarterly Summary of Operations - MGE Energy (unaudited).
| (In thousands, except per share amounts) |  | Quarters Ended |
| 2019 |  | March 31 |  | June 30 |  | September 30 |  | December 31 |
| Operating revenues: |  |  |  |  |  |  |  |  |
| Electric revenues | $ | 97,469 | $ | 97,077 | $ | 120,821 | $ | 93,613 |
| Gas revenues |  | 70,100 |  | 25,070 |  | 17,377 |  | 47,328 |
| Total Operating Revenues |  | 167,569 |  | 122,147 |  | 138,198 |  | 140,941 |
| Operating expenses |  | 137,057 |  | 102,364 |  | 99,460 |  | 119,064 |
| Operating income |  | 30,512 |  | 19,783 |  | 38,738 |  | 21,877 |
| Interest and other income, net |  | (796) |  | (730) |  | (627) |  | (2,099) |
| Income tax provision |  | (5,709) |  | (3,505) |  | (7,454) |  | (3,116) |
| Earnings on common stock | $ | 24,007 | $ | 15,548 | $ | 30,657 | $ | 16,662 |
| Earnings per common share | $ | 0.69 | $ | 0.45 | $ | 0.88 | $ | 0.48 |
| Dividends per share | $ | 0.338 | $ | 0.338 | $ | 0.353 | $ | 0.353 |
| 2018 |  |  |  |  |  |  |  |  |
| Operating revenues: |  |  |  |  |  |  |  |  |
| Electric revenues | $ | 94,867 | $ | 99,282 | $ | 119,388 | $ | 88,464 |
| Gas revenues |  | 62,765 |  | 24,980 |  | 18,407 |  | 51,615 |
| Total Operating Revenues |  | 157,632 |  | 124,262 |  | 137,795 |  | 140,079 |
| Operating expenses |  | 131,444 |  | 100,031 |  | 97,997 |  | 116,089 |
| Operating income |  | 26,188 |  | 24,231 |  | 39,798 |  | 23,990 |
| Interest and other income, net |  | 180 |  | (52) |  | (695) |  | (1,987) |
| Income tax provision |  | (6,367) |  | (5,828) |  | (9,597) |  | (5,642) |
| Earnings on common stock | $ | 20,001 | $ | 18,351 | $ | 29,506 | $ | 16,361 |
| Earnings per common share | $ | 0.58 | $ | 0.53 | $ | 0.85 | $ | 0.47 |
| Dividends per share | $ | 0.323 | $ | 0.323 | $ | 0.338 | $ | 0.338 |
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 The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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