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Madison Gas and Electric Company Consolidated Statements of Common Equity (Unaudited) - 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 Income/(Loss) [Member] | Accumulated Other Comprehensive Income/(Loss) [Member] MGE [Member] | Noncontrolling Interest [Member] MGE [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance, shares at Dec. 31, 2014 |  |  | 34,668 | 17,348 |  |  |  |  |  |
Beginning balance, value before adjustments at Dec. 31, 2014 |  | $ 612,260 |  |  |  |  | $ 276,662 |  |  |
Cumulative effect of new accounting principle at Dec. 31, 2014 | $ (142) | (142) |  |  |  | $ (142) | (142) |  |  |
Beginning balance, value at Dec. 31, 2014 |  | 612,118 |  | $ 17,348 | $ 192,417 |  | 276,520 |  | $ 144 | $ 125,689
Increase (Decrease) In Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income |  | 31,829 |  |  |  |  | 18,650 |  |  | 13,179
Other comprehensive loss | (95) | (109) |  |  |  |  |  | $ (95) | (109) |
Cash dividends paid to parent by MGE |  | (10,000) |  |  |  |  | (10,000) |  |  |
Equity contribution received by noncontrolling interest |  | 2,875 |  |  |  |  |  |  |  | 2,875
Distributions to parent from noncontrolling interest |  | (10,084) |  |  |  |  |  |  |  | (10,084)
Ending balance, shares at Jun. 30, 2015 |  |  | 34,668 | 17,348 |  |  |  |  |  |
Ending balance, value at Jun. 30, 2015 |  | 626,629 |  | $ 17,348 | 192,417 |  | 285,170 |  | 35 | 131,659
Beginning balance, shares at Dec. 31, 2015 |  |  | 34,668 | 17,348 |  |  |  |  |  |
Beginning balance, value at Dec. 31, 2015 |  | 641,984 |  | $ 17,348 | 192,417 |  | 291,888 |  | 23 | 140,308
Increase (Decrease) In Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income |  | 33,287 |  |  |  |  | 21,083 |  |  | 12,204
Other comprehensive loss | $ (154) | (39) |  |  |  |  |  | $ (154) | (39) |
Cash dividends paid to parent by MGE |  | (25,000) |  |  |  |  | (25,000) |  |  |
Equity contribution received by noncontrolling interest |  | 710 |  |  |  |  |  |  |  | 710
Distributions to parent from noncontrolling interest |  | (10,552) |  |  |  |  |  |  |  | (10,552)
Ending balance, shares at Jun. 30, 2016 |  |  | 34,668 | 17,348 |  |  |  |  |  |
Ending balance, value at Jun. 30, 2016 |  | $ 640,390 |  | $ 17,348 | $ 192,417 |  | $ 287,971 |  | $ (16) | $ 142,670

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