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Madison Gas and Electric Company Consolidated Statements of Equity - USD ($) shares 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, 2016 |  |  | 34,668 | 17,348 |  |  |  |  |  |
Beginning balance, value at Dec. 31, 2016 |  | $ 602,749,000 |  | $ 17,348,000 | $ 192,417,000 |  | $ 277,300,000 |  | $ 19,000 | $ 115,665,000
Increase (Decrease) in Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income | $ 97,606,000 | 93,072,000 |  |  |  |  | 49,835,000 |  |  | 43,237,000
Other comprehensive income (loss) | 175,000 | (47,000) |  |  |  |  |  | $ 175,000 | (47,000) |
Cash dividends paid to parent by MGE |  | (45,000,000) |  |  |  |  | (45,000,000) |  |  |
Capital contributions from parent |  | 0 |  |  |  |  |  |  |  |
Distributions to parent from noncontrolling interest |  | (18,000,000) |  |  |  |  |  |  |  | (18,000,000)
Ending balance, shares at Dec. 31, 2017 |  |  | 34,668 | 17,348 |  |  |  |  |  |
Ending balance, value at Dec. 31, 2017 |  | 632,774,000 |  | $ 17,348,000 | 192,417,000 |  | 282,135,000 |  | (28,000) | 140,902,000
Increase (Decrease) in Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle | 0 | 0 |  |  |  | $ 377,000 | (28,000) | (377,000) | 28,000 |
Beginning balance, value - Adjusted at Dec. 31, 2017 | 778,187,000 | 632,774,000 |  |  |  | $ 427,251,000 | 282,107,000 | $ 0 | 0 |
Increase (Decrease) in Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income | 84,219,000 | 79,036,000 |  |  |  |  | 56,484,000 |  |  | 22,552,000
Cash dividends paid to parent by MGE |  | 0 |  |  |  |  |  |  |  |
Capital contributions from parent |  | 0 |  |  |  |  |  |  |  |
Distributions to parent from noncontrolling interest |  | (22,000,000) |  |  |  |  |  |  |  | (22,000,000)
Ending balance, shares at Dec. 31, 2018 |  |  | 34,668 | 17,348 |  |  |  |  |  |
Ending balance, value at Dec. 31, 2018 |  | 689,810,000 |  | $ 17,348,000 | 192,417,000 |  | 338,591,000 |  | 0 | 141,454,000
Increase (Decrease) in Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income | $ 86,874,000 | 80,779,000 |  |  |  |  | 58,430,000 |  |  | 22,349,000
Cash dividends paid to parent by MGE |  | 0 |  |  |  |  |  |  |  |
Capital contributions from parent |  | 30,500,000 |  |  | 30,500,000 |  |  |  |  |
Distributions to parent from noncontrolling interest |  | (23,500,000) |  |  |  |  |  |  |  | (23,500,000)
Ending balance, shares at Dec. 31, 2019 |  |  | 34,668 | 17,348 |  |  |  |  |  |
Ending balance, value at Dec. 31, 2019 |  | $ 777,589,000 |  | $ 17,348,000 | $ 222,917,000 |  | $ 397,021,000 |  | $ 0 | $ 140,303,000

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