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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 155,263 | $ 140,099 | $ 128,288 | $ 167,237 | $ 137,005 | $ 137,838 | $ 117,221 | $ 149,259 | $ 590,887 |  | $ 541,323 |  | $ 546,382 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (38,838) |  | (38,707) |  | (40,942) |
Other operating expenses |  |  |  |  |  |  |  |  | (424,062) |  | (389,853) |  | (397,572) |
Operating Income | 25,962 | 39,900 | 24,497 | 37,628 | 19,350 | 39,888 | 25,081 | 28,444 | 127,987 |  | 112,763 |  | 107,868 |
Other (deductions) income, net |  |  |  |  |  |  |  |  | 10,701 |  | 10,069 |  | 9,214 |
Interest (expense) income, net |  |  |  |  |  |  |  |  | (18,924) |  | (19,467) |  | (20,162) |
Income before income taxes |  |  |  |  |  |  |  |  | 119,764 |  | 103,365 |  | 96,920 |
Income tax (provision) benefit | (7,829) | (14,692) | (8,660) | (13,678) | (6,208) | (14,253) | (8,596) | (9,862) | (44,859) |  | (38,919) |  | (35,992) |
Net Income | 14,077 | 24,353 | 13,891 | 22,584 | 10,486 | 23,642 | 14,270 | 16,048 | 74,905 |  | 64,446 |  | 60,928 |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 1,579,060 |  |  |  | 1,586,924 |  |  |  | 1,579,060 |  | 1,586,924 |  | 1,458,882 |
Capital expenditures |  |  |  |  |  |  |  |  | 119,047 |  | 98,435 |  | 65,176 |
Electric [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 404,494 |  | 392,852 |  | 376,353 |
Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 194,091 |  | 152,541 |  | 177,711 |
Non Regulated Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 48,059 |  | 43,945 |  | 43,401 |
Transmission Investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
All Others [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Operating Segments [Member] | Electric [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 403,957 |  | 392,365 |  | 375,858 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (25,780) |  | (26,031) |  | (28,323) |
Other operating expenses |  |  |  |  |  |  |  |  | (316,277) |  | (300,149) |  | (292,080) |
Operating Income |  |  |  |  |  |  |  |  | 62,437 |  | 66,672 |  | 55,950 |
Other (deductions) income, net |  |  |  |  |  |  |  |  | 3,062 |  | 1,145 |  | 71 |
Interest (expense) income, net |  |  |  |  |  |  |  |  | (9,645) |  | (10,189) |  | (10,849) |
Income before income taxes |  |  |  |  |  |  |  |  | 55,854 |  | 57,628 |  | 45,172 |
Income tax (provision) benefit |  |  |  |  |  |  |  |  | (19,176) |  | (20,906) |  | (15,334) |
Net Income |  |  |  |  |  |  |  |  | 36,678 |  | 36,722 |  | 29,838 |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 899,257 |  |  |  | 888,444 |  |  |  | 899,257 |  | 888,444 |  | 794,738 |
Capital expenditures |  |  |  |  |  |  |  |  | 100,146 |  | 81,965 |  | 47,206 |
Operating Segments [Member] | Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 181,462 |  | 139,727 |  | 165,271 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (5,898) |  | (5,569) |  | (5,593) |
Other operating expenses |  |  |  |  |  |  |  |  | (162,661) |  | (136,567) |  | (155,444) |
Operating Income |  |  |  |  |  |  |  |  | 25,532 |  | 10,405 |  | 16,674 |
Other (deductions) income, net |  |  |  |  |  |  |  |  | 59 |  | 323 |  | 20 |
Interest (expense) income, net |  |  |  |  |  |  |  |  | (2,986) |  | (2,874) |  | (3,060) |
Income before income taxes |  |  |  |  |  |  |  |  | 22,605 |  | 7,854 |  | 13,634 |
Income tax (provision) benefit |  |  |  |  |  |  |  |  | (9,168) |  | (2,769) |  | (5,249) |
Net Income |  |  |  |  |  |  |  |  | 13,437 |  | 5,085 |  | 8,385 |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 265,694 |  |  |  | 285,468 |  |  |  | 265,694 |  | 285,468 |  | 285,702 |
Capital expenditures |  |  |  |  |  |  |  |  | 15,554 |  | 13,812 |  | 15,830 |
Operating Segments [Member] | Non Regulated Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 5,468 |  | 9,231 |  | 5,253 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (7,156) |  | (7,107) |  | (7,026) |
Other operating expenses |  |  |  |  |  |  |  |  | (128) |  | (121) |  | (174) |
Operating Income |  |  |  |  |  |  |  |  | 40,775 |  | 36,717 |  | 36,201 |
Other (deductions) income, net |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Interest (expense) income, net |  |  |  |  |  |  |  |  | (6,400) |  | (6,537) |  | (6,331) |
Income before income taxes |  |  |  |  |  |  |  |  | 34,375 |  | 30,180 |  | 29,870 |
Income tax (provision) benefit |  |  |  |  |  |  |  |  | (13,682) |  | (12,113) |  | (11,988) |
Net Income |  |  |  |  |  |  |  |  | 20,693 |  | 18,067 |  | 17,882 |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 288,116 |  |  |  | 323,216 |  |  |  | 288,116 |  | 323,216 |  | 299,421 |
Capital expenditures |  |  |  |  |  |  |  |  | 3,347 |  | 2,658 |  | 2,140 |
Operating Segments [Member] | Transmission Investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other operating expenses |  |  |  |  |  |  |  |  | (1) |  | 0 |  | 0 |
Operating Income |  |  |  |  |  |  |  |  | (1) |  | 0 |  | 0 |
Other (deductions) income, net |  |  |  |  |  |  |  |  | 9,434 |  | 9,080 |  | 8,614 |
Interest (expense) income, net |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Income before income taxes |  |  |  |  |  |  |  |  | 9,433 |  | 9,080 |  | 8,614 |
Income tax (provision) benefit |  |  |  |  |  |  |  |  | (3,796) |  | (3,648) |  | (3,467) |
Net Income |  |  |  |  |  |  |  |  | 5,637 |  | 5,432 |  | 5,147 |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 64,504 |  |  |  | 61,064 |  |  |  | 64,504 |  | 61,064 |  | 57,006 |
Capital expenditures |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Operating Segments [Member] | All Others [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (4) |  | 0 |  | 0 |
Other operating expenses |  |  |  |  |  |  |  |  | (752) |  | (1,031) |  | (957) |
Operating Income |  |  |  |  |  |  |  |  | (756) |  | (1,031) |  | (957) |
Other (deductions) income, net |  |  |  |  |  |  |  |  | (1,854) |  | (479) |  | 509 |
Interest (expense) income, net |  |  |  |  |  |  |  |  | 107 |  | 133 |  | 78 |
Income before income taxes |  |  |  |  |  |  |  |  | (2,503) |  | (1,377) |  | (370) |
Income tax (provision) benefit |  |  |  |  |  |  |  |  | 963 |  | 517 |  | 46 |
Net Income |  |  |  |  |  |  |  |  | (1,540) |  | (860) |  | (324) |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 431,436 |  |  |  | 413,291 |  |  |  | 431,436 |  | 413,291 |  | 401,862 |
Capital expenditures |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Operating Segments [Member] | Assets Not Allocated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 19,853 |  |  |  | 18,559 |  |  |  | 19,853 |  | 18,559 |  | 32,882 |
Capital expenditures |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Consolidation/Elimination Entries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | (55,757) |  | (48,015) |  | (51,083) |
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other operating expenses |  |  |  |  |  |  |  |  | 55,757 |  | 48,015 |  | 51,083 |
Operating Income |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other (deductions) income, net |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Interest (expense) income, net |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Income before income taxes |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Income tax (provision) benefit |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Net Income |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | (389,800) |  |  |  | (403,118) |  |  |  | (389,800) |  | (403,118) |  | (412,729) |
Capital expenditures |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Consolidation/Elimination Entries [Member] | Electric [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 537 |  | 487 |  | 495 |
Consolidation/Elimination Entries [Member] | Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 12,629 |  | 12,814 |  | 12,440 |
Consolidation/Elimination Entries [Member] | Non Regulated Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 42,591 |  | 34,714 |  | 38,148 |
Consolidation/Elimination Entries [Member] | Transmission Investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Consolidation/Elimination Entries [Member] | All Others [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
MGE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 590,925 |  | 541,323 |  | 546,382 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (38,834) |  | (38,707) |  | (40,942) |
Other operating expenses |  |  |  |  |  |  |  |  | (464,868) | [1] | (424,156) | [1] | (428,903) | [1]
Operating Income |  |  |  |  |  |  |  |  | 87,223 | [1] | 78,460 | [1] | 76,537 | [1]
Other (deductions) income, net |  |  |  |  |  |  |  |  | 8,253 | [1] | 6,446 | [1] | 4,955 | [1]
Interest (expense) income, net |  |  |  |  |  |  |  |  | (19,031) |  | (19,600) |  | (20,240) |
Income tax (provision) benefit |  |  |  |  |  |  |  |  | (45,822) |  | (39,435) |  | (36,039) |
Net Income Including Noncontrolling Interest |  |  |  |  |  |  |  |  | 76,445 |  | 65,306 |  | 61,252 |
Less Net Income Attributable to Noncontrolling Interest, net of tax |  |  |  |  |  |  |  |  | (27,438) |  | (24,489) |  | (23,970) |
Net Income |  |  |  |  |  |  |  |  | 49,007 |  | 40,817 |  | 37,282 |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 1,530,643 |  |  |  | 1,553,651 |  |  |  | 1,530,643 |  | 1,553,651 |  | 1,433,793 |
Capital expenditures |  |  |  |  |  |  |  |  | 119,047 |  | 98,435 |  | 65,176 |
MGE [Member] | Electric [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 404,494 |  | 392,852 |  | 376,353 |
MGE [Member] | Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 194,091 |  | 152,541 |  | 177,711 |
MGE [Member] | Non Regulated Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 48,059 |  | 43,945 |  | 43,401 |
MGE [Member] | Transmission Investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
MGE [Member] | Operating Segments [Member] | Electric [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 403,980 |  | 392,365 |  | 375,858 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (25,780) |  | (26,031) |  | (28,323) |
Other operating expenses |  |  |  |  |  |  |  |  | (335,059) | [1] | (320,701) | [1] | (307,193) | [1]
Operating Income |  |  |  |  |  |  |  |  | 43,655 | [1] | 46,120 | [1] | 40,837 | [1]
Other (deductions) income, net |  |  |  |  |  |  |  |  | 2,668 | [1] | 791 | [1] | (150) | [1]
Interest (expense) income, net |  |  |  |  |  |  |  |  | (9,645) |  | (10,189) |  | (10,849) |
Net Income Including Noncontrolling Interest |  |  |  |  |  |  |  |  | 36,678 |  | 36,722 |  | 29,838 |
Less Net Income Attributable to Noncontrolling Interest, net of tax |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Net Income |  |  |  |  |  |  |  |  | 36,678 |  | 36,722 |  | 29,838 |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 899,257 |  |  |  | 888,444 |  |  |  | 899,257 |  | 888,444 |  | 794,738 |
Capital expenditures |  |  |  |  |  |  |  |  | 100,146 |  | 81,965 |  | 47,206 |
MGE [Member] | Operating Segments [Member] | Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 181,477 |  | 139,727 |  | 165,271 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (5,898) |  | (5,569) |  | (5,593) |
Other operating expenses |  |  |  |  |  |  |  |  | (171,717) | [1] | (139,236) | [1] | (160,631) | [1]
Operating Income |  |  |  |  |  |  |  |  | 16,476 | [1] | 7,736 | [1] | 11,487 | [1]
Other (deductions) income, net |  |  |  |  |  |  |  |  | (53) | [1] | 223 | [1] | (42) | [1]
Interest (expense) income, net |  |  |  |  |  |  |  |  | (2,986) |  | (2,874) |  | (3,060) |
Net Income Including Noncontrolling Interest |  |  |  |  |  |  |  |  | 13,437 |  | 5,085 |  | 8,385 |
Less Net Income Attributable to Noncontrolling Interest, net of tax |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Net Income |  |  |  |  |  |  |  |  | 13,437 |  | 5,085 |  | 8,385 |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 265,694 |  |  |  | 285,468 |  |  |  | 265,694 |  | 285,468 |  | 285,702 |
Capital expenditures |  |  |  |  |  |  |  |  | 15,554 |  | 13,812 |  | 15,830 |
MGE [Member] | Operating Segments [Member] | Non Regulated Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 5,468 |  | 9,231 |  | 5,253 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (7,156) |  | (7,107) |  | (7,026) |
Other operating expenses |  |  |  |  |  |  |  |  | (13,810) | [1] | (12,234) | [1] | (12,162) | [1]
Operating Income |  |  |  |  |  |  |  |  | 27,093 | [1] | 24,604 | [1] | 24,213 | [1]
Other (deductions) income, net |  |  |  |  |  |  |  |  | 0 | [1] | 0 | [1] | 0 | [1]
Interest (expense) income, net |  |  |  |  |  |  |  |  | (6,400) |  | (6,537) |  | (6,331) |
Net Income Including Noncontrolling Interest |  |  |  |  |  |  |  |  | 20,693 |  | 18,067 |  | 17,882 |
Less Net Income Attributable to Noncontrolling Interest, net of tax |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Net Income |  |  |  |  |  |  |  |  | 20,693 |  | 18,067 |  | 17,882 |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 288,066 |  |  |  | 323,166 |  |  |  | 288,066 |  | 323,166 |  | 299,171 |
Capital expenditures |  |  |  |  |  |  |  |  | 3,347 |  | 2,658 |  | 2,140 |
MGE [Member] | Operating Segments [Member] | Transmission Investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other operating expenses |  |  |  |  |  |  |  |  | (1) | [1] | 0 | [1] | 0 | [1]
Operating Income |  |  |  |  |  |  |  |  | (1) | [1] | 0 | [1] | 0 | [1]
Other (deductions) income, net |  |  |  |  |  |  |  |  | 5,638 | [1] | 5,432 | [1] | 5,147 | [1]
Interest (expense) income, net |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Net Income Including Noncontrolling Interest |  |  |  |  |  |  |  |  | 5,637 |  | 5,432 |  | 5,147 |
Less Net Income Attributable to Noncontrolling Interest, net of tax |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Net Income |  |  |  |  |  |  |  |  | 5,637 |  | 5,432 |  | 5,147 |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 64,504 |  |  |  | 61,064 |  |  |  | 64,504 |  | 61,064 |  | 57,006 |
Capital expenditures |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
MGE [Member] | Operating Segments [Member] | Assets Not Allocated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | 19,853 |  |  |  | 18,559 |  |  |  | 19,853 |  | 18,559 |  | 32,882 |
Capital expenditures |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
MGE [Member] | Consolidation/Elimination Entries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | (55,719) |  | (48,015) |  | (51,083) |
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Other operating expenses |  |  |  |  |  |  |  |  | 55,719 | [1] | 48,015 | [1] | 51,083 | [1]
Operating Income |  |  |  |  |  |  |  |  | 0 | [1] | 0 | [1] | 0 | [1]
Other (deductions) income, net |  |  |  |  |  |  |  |  | 0 | [1] | 0 | [1] | 0 | [1]
Interest (expense) income, net |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Net Income Including Noncontrolling Interest |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Less Net Income Attributable to Noncontrolling Interest, net of tax |  |  |  |  |  |  |  |  | (27,438) |  | (24,489) |  | (23,970) |
Net Income |  |  |  |  |  |  |  |  | (27,438) |  | (24,489) |  | (23,970) |
Segment Reporting Information Assets And Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | (6,731) |  |  |  | (23,050) |  |  |  | (6,731) |  | (23,050) |  | (35,706) |
Capital expenditures |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
MGE [Member] | Consolidation/Elimination Entries [Member] | Electric [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 514 |  | 487 |  | 495 |
MGE [Member] | Consolidation/Elimination Entries [Member] | Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 12,614 |  | 12,814 |  | 12,440 |
MGE [Member] | Consolidation/Elimination Entries [Member] | Non Regulated Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 42,591 |  | 34,714 |  | 38,148 |
MGE [Member] | Consolidation/Elimination Entries [Member] | Transmission Investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  | $ 0 |
[1] | *Amounts are shown net of the related tax expense, consistent with the presentation on the consolidated MGE Income Statement.

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