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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Operating revenues | $ 167,237 | $ 149,259 |
Interdepartmental revenues | 0 | 0 |
Total operating revenues | 167,237 | 149,259 |
Depreciation and amortization | (9,624) | (9,624) |
Other operating expenses | (119,985) | (111,191) |
Operating Income | 37,628 | 28,444 |
Other (deductions) income, net | 3,309 | 2,570 |
Interest (expense) income, net | (4,675) | (5,104) |
Income before income taxes | 36,262 | 25,910 |
Income tax provision | (13,678) | (9,862) |
Net Income (Loss) | 22,584 | 16,048 |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | 1,580,440 |  | 1,586,924
Capital Expenditures | 29,164 |  | 98,435
Electric [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 93,494 | 89,936 |
Interdepartmental revenues | 109 | 109 |
Total operating revenues | 93,603 | 90,045 |
Depreciation and amortization | (6,400) | (6,478) |
Other operating expenses | (74,925) | (72,788) |
Operating Income | 12,278 | 10,779 |
Other (deductions) income, net | 575 | 164 |
Interest (expense) income, net | (2,404) | (2,727) |
Income before income taxes | 10,449 | 8,216 |
Income tax provision | (3,433) | (2,785) |
Net Income (Loss) | 7,016 | 5,431 |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | 904,578 |  | 888,444
Capital Expenditures | 27,007 |  | 81,965
Gas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 72,467 | 57,019 |
Interdepartmental revenues | 4,876 | 2,986 |
Total operating revenues | 77,343 | 60,005 |
Depreciation and amortization | (1,425) | (1,370) |
Other operating expenses | (60,437) | (49,741) |
Operating Income | 15,481 | 8,894 |
Other (deductions) income, net | 162 | 46 |
Interest (expense) income, net | (678) | (769) |
Income before income taxes | 14,965 | 8,171 |
Income tax provision | (5,989) | (3,238) |
Net Income (Loss) | 8,976 | 4,933 |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | 275,815 |  | 285,468
Capital Expenditures | 1,689 |  | 13,812
Non Regulated Energy [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 1,276 | 2,304 |
Interdepartmental revenues | 10,573 | 8,676 |
Total operating revenues | 11,849 | 10,980 |
Depreciation and amortization | (1,799) | (1,776) |
Other operating expenses | (37) | (12) |
Operating Income | 10,013 | 9,192 |
Other (deductions) income, net | 0 | 0 |
Interest (expense) income, net | (1,613) | (1,645) |
Income before income taxes | 8,400 | 7,547 |
Income tax provision | (3,257) | (3,029) |
Net Income (Loss) | 5,143 | 4,518 |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | 324,894 |  | 323,216
Capital Expenditures | 468 |  | 2,658
Transmission Investment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 |
Interdepartmental revenues | 0 | 0 |
Total operating revenues | 0 | 0 |
Depreciation and amortization | 0 | 0 |
Other operating expenses | 0 | 0 |
Operating Income | 0 | 0 |
Other (deductions) income, net | 2,396 | 2,242 |
Interest (expense) income, net | 0 | 0 |
Income before income taxes | 2,396 | 2,242 |
Income tax provision | (971) | (910) |
Net Income (Loss) | 1,425 | 1,332 |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | 61,826 |  | 61,064
Capital Expenditures | 0 |  | 0
All Others [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 |
Interdepartmental revenues | 0 | 0 |
Total operating revenues | 0 | 0 |
Depreciation and amortization | 0 | 0 |
Other operating expenses | (144) | (421) |
Operating Income | (144) | (421) |
Other (deductions) income, net | 176 | 118 |
Interest (expense) income, net | 20 | 37 |
Income before income taxes | 52 | (266) |
Income tax provision | (28) | 100 |
Net Income (Loss) | 24 | (166) |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | 409,602 |  | 413,291
Capital Expenditures | 0 |  | 0
Consolidation Elimination Entries [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 |
Interdepartmental revenues | (15,558) | (11,771) |
Total operating revenues | (15,558) | (11,771) |
Depreciation and amortization | 0 | 0 |
Other operating expenses | 15,558 | 11,771 |
Operating Income | 0 | 0 |
Other (deductions) income, net | 0 | 0 |
Interest (expense) income, net | 0 | 0 |
Income before income taxes | 0 | 0 |
Income tax provision | 0 | 0 |
Net Income (Loss) | 0 | 0 |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | (408,175) |  | (403,118)
Capital Expenditures | 0 |  | 0
Assets Not Allocated [Member] |  |  |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | 11,900 |  | 18,559
Capital Expenditures | 0 |  | 0
MGE [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 167,237 | 149,259 |
Interdepartmental revenues | 0 | 0 |
Total operating revenues | 167,237 | 149,259 |
Depreciation and amortization | (9,624) | (9,624) |
Other operating expenses | (132,710) | (119,739) |
Operating Income | 24,903 | 19,896 |
Other (deductions) income, net | 2,352 | 1,459 |
Interest (expense) income, net | (4,695) | (5,141) |
Income tax provision | (12,870) | (8,969) |
Net Income Including Noncontrolling Interest | 22,560 | 16,214 |
Less Net Income Attributable to Noncontrolling Interest, net of tax | (6,826) | (6,072) |
Net Income (Loss) | 15,734 | 10,142 |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | 1,550,605 |  | 1,553,651
Capital Expenditures | 29,164 |  | 98,435
MGE [Member] | Electric [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 93,494 | 89,936 |
Interdepartmental revenues | 109 | 109 |
Total operating revenues | 93,603 | 90,045 |
Depreciation and amortization | (6,400) | (6,478) |
Other operating expenses | (78,506) | (75,508) |
Operating Income | 8,697 | 8,059 |
Other (deductions) income, net | 723 | 99 |
Interest (expense) income, net | (2,404) | (2,727) |
Net Income Including Noncontrolling Interest | 7,016 | 5,431 |
Less Net Income Attributable to Noncontrolling Interest, net of tax | 0 | 0 |
Net Income (Loss) | 7,016 | 5,431 |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | 904,578 |  | 888,444
Capital Expenditures | 27,007 |  | 81,965
MGE [Member] | Gas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 72,467 | 57,019 |
Interdepartmental revenues | 4,876 | 2,986 |
Total operating revenues | 77,343 | 60,005 |
Depreciation and amortization | (1,425) | (1,370) |
Other operating expenses | (66,468) | (52,961) |
Operating Income | 9,450 | 5,674 |
Other (deductions) income, net | 204 | 28 |
Interest (expense) income, net | (678) | (769) |
Net Income Including Noncontrolling Interest | 8,976 | 4,933 |
Less Net Income Attributable to Noncontrolling Interest, net of tax | 0 | 0 |
Net Income (Loss) | 8,976 | 4,933 |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | 275,815 |  | 285,468
Capital Expenditures | 1,689 |  | 13,812
MGE [Member] | Non Regulated Energy [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 1,276 | 2,304 |
Interdepartmental revenues | 10,573 | 8,676 |
Total operating revenues | 11,849 | 10,980 |
Depreciation and amortization | (1,799) | (1,776) |
Other operating expenses | (3,294) | (3,041) |
Operating Income | 6,756 | 6,163 |
Other (deductions) income, net | 0 | 0 |
Interest (expense) income, net | (1,613) | (1,645) |
Net Income Including Noncontrolling Interest | 5,143 | 4,518 |
Less Net Income Attributable to Noncontrolling Interest, net of tax | 0 | 0 |
Net Income (Loss) | 5,143 | 4,518 |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | 324,844 |  | 323,166
Capital Expenditures | 468 |  | 2,658
MGE [Member] | Transmission Investment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 |
Interdepartmental revenues | 0 | 0 |
Total operating revenues | 0 | 0 |
Depreciation and amortization | 0 | 0 |
Other operating expenses | 0 | 0 |
Operating Income | 0 | 0 |
Other (deductions) income, net | 1,425 | 1,332 |
Interest (expense) income, net | 0 | 0 |
Net Income Including Noncontrolling Interest | 1,425 | 1,332 |
Less Net Income Attributable to Noncontrolling Interest, net of tax | 0 | 0 |
Net Income (Loss) | 1,425 | 1,332 |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | 61,826 |  | 61,064
Capital Expenditures | 0 |  | 0
MGE [Member] | Consolidation Elimination Entries [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 |
Interdepartmental revenues | (15,558) | (11,771) |
Total operating revenues | (15,558) | (11,771) |
Depreciation and amortization | 0 | 0 |
Other operating expenses | 15,558 | 11,771 |
Operating Income | 0 | 0 |
Other (deductions) income, net | 0 | 0 |
Interest (expense) income, net | 0 | 0 |
Net Income Including Noncontrolling Interest | 0 | 0 |
Less Net Income Attributable to Noncontrolling Interest, net of tax | (6,826) | (6,072) |
Net Income (Loss) | (6,826) | (6,072) |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | (28,358) |  | (23,050)
Capital Expenditures | 0 |  | 0
MGE [Member] | Assets Not Allocated [Member] |  |  |
Segment Reporting Assets And Capital Expenditures [Abstract] |  |  |
Assets | 11,900 |  | 18,559
Capital Expenditures | $ 0 |  | $ 0

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