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Income Taxes (Details) (USD $) | 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
Income tax provision components [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current payable: Federal |  |  |  |  |  |  |  |  | $ (1,508,000) | $ (6,053,000) | $ (1,504,000)
Current payable: State |  |  |  |  |  |  |  |  | 8,213,000 | 436,000 | 4,580,000
Net-deferred: Federal |  |  |  |  |  |  |  |  | 37,203,000 | 37,178,000 | 30,115,000
Net-deferred: State |  |  |  |  |  |  |  |  | 1,163,000 | 7,618,000 | 3,102,000
Amortized investment tax credits |  |  |  |  |  |  |  |  | (212,000) | (260,000) | (301,000)
Total income tax provision | 7,829,000 | 14,692,000 | 8,660,000 | 13,678,000 | 6,208,000 | 14,253,000 | 8,596,000 | 9,862,000 | 44,859,000 | 38,919,000 | 35,992,000
Reconciliation of tax provision to statutory federal income tax rate [Abstract] |  |  |  |  |  |  |  |  |  |  |
Statutory federal income tax rate |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
State income taxes, net of federal benefit |  |  |  |  |  |  |  |  | 5.10% | 5.00% | 5.10%
Amortized investment tax credits |  |  |  |  |  |  |  |  | (0.20%) | (0.30%) | (0.30%)
Credit for electricity from wind energy |  |  |  |  |  |  |  |  | (1.50%) | (1.60%) | (1.80%)
Domestic manufacturing deduction |  |  |  |  |  |  |  |  | (0.20%) | 0.30% | (0.70%)
AFUDC Equity, net |  |  |  |  |  |  |  |  | (0.70%) | (0.40%) | 0.00%
Other, net, individually significant |  |  |  |  |  |  |  |  | 0.00% | (0.30%) | (0.20%)
Effective income tax rate |  |  |  |  |  |  |  |  | 37.50% | 37.70% | 37.10%
Deferred tax liabilities (assets) on balance sheet [Abstract] |  |  |  |  |  |  |  |  |  |  |
Property-related | 263,881,000 |  |  |  | 248,545,000 |  |  |  | 263,881,000 | 248,545,000 |
Investment in ATC | 32,696,000 |  |  |  | 29,147,000 |  |  |  | 32,696,000 | 29,147,000 |
Bond transactions | 1,553,000 |  |  |  | 1,643,000 |  |  |  | 1,553,000 | 1,643,000 |
Pension and other postretirement benefits | 34,478,000 |  |  |  | 82,072,000 |  |  |  | 34,478,000 | 82,072,000 |
Derivatives | 26,361,000 |  |  |  | 29,134,000 |  |  |  | 26,361,000 | 29,134,000 |
Tax deductible prepayments | 7,508,000 |  |  |  | 7,233,000 |  |  |  | 7,508,000 | 7,233,000 |
Other deferred tax liabilities | 1,995,000 |  |  |  | 10,662,000 |  |  |  | 1,995,000 | 10,662,000 |
Gross deferred income tax liabilities | 368,472,000 |  |  |  | 408,436,000 |  |  |  | 368,472,000 | 408,436,000 |
Future federal tax benefit | 0 |  |  |  | (25,626,000) |  |  |  | 0 | (25,626,000) |
Accrued expenses | (17,195,000) |  |  |  | (30,277,000) |  |  |  | (17,195,000) | (30,277,000) |
Pension and other postretirement benefits | (26,838,000) |  |  |  | (69,941,000) |  |  |  | (26,838,000) | (69,941,000) |
Deferred tax regulatory account | (1,402,000) |  |  |  | (1,551,000) |  |  |  | (1,402,000) | (1,551,000) |
Derivatives | (26,361,000) |  |  |  | (29,134,000) |  |  |  | (26,361,000) | (29,134,000) |
Other deferred tax assets | (10,369,000) |  |  |  | (5,345,000) |  |  |  | (10,369,000) | (5,345,000) |
Gross deferred income tax assets | (82,165,000) |  |  |  | (161,874,000) |  |  |  | (82,165,000) | (161,874,000) |
Less valuation allowance | 195,000 |  |  |  | 365,000 |  |  |  | 195,000 | 365,000 |
Net deferred income tax assets | (81,970,000) |  |  |  | (161,509,000) |  |  |  | (81,970,000) | (161,509,000) |
Deferred income taxes | 286,502,000 |  |  |  | 246,927,000 |  |  |  | 286,502,000 | 246,927,000 |
Operating loss deductions and tax credit carryforwards [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforward | 0 |  |  |  | 63,400,000 |  |  |  | 0 | 63,400,000 |
Operating loss carryforward, deferred tax asset |  |  |  |  | 22,200,000 |  |  |  |  | 22,200,000 |
Tax credit carryforward, amount | 0 |  |  |  | 3,400,000 |  |  |  | 0 | 3,400,000 |
Tax credit carryforward, deferred tax asset |  |  |  |  | 3,400,000 |  |  |  |  | 3,400,000 |
State net tax operating loss deductions | 4,000,000 |  |  |  |  |  |  |  | 4,000,000 |  |
Unrecognized tax benefits [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits, beginning balance |  |  |  | 3,204,000 |  |  |  | 2,364,000 | 3,204,000 | 2,364,000 | 4,377,000
Additions based on tax positions related to current year |  |  |  |  |  |  |  |  | 377,000 | 401,000 | 128,000
Additions based on tax positions related to prior year |  |  |  |  |  |  |  |  | 424,000 | 580,000 | 427,000
Reductions based on tax positions related to the current year |  |  |  |  |  |  |  |  | (40,000) | 0 | 0
Reductions based on tax positions related to prior years |  |  |  |  |  |  |  |  | (1,602,000) | (141,000) | (2,568,000)
Unrecognized tax benefits, ending balance | 2,363,000 |  |  |  | 3,204,000 |  |  |  | 2,363,000 | 3,204,000 | 2,364,000
Interest on unrecognized tax benefits [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Accrued interest on unrecognized tax benefits, beginning balance |  |  |  | 314,000 |  |  |  | 216,000 | 314,000 | 216,000 | 214,000
Reduction in interest expense on uncertain tax positions |  |  |  |  |  |  |  |  | (275,000) | 0 | 0
Interest expense on uncertain tax positions |  |  |  |  |  |  |  |  | 62,000 | 98,000 | 2,000
Accrued interest on unrecognized tax benefits, ending balance | 101,000 |  |  |  | 314,000 |  |  |  | 101,000 | 314,000 | 216,000
Unrecognized Tax Benefits |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits permanent differences | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 200,000
MGE [Member] |  |  |  |  |  |  |  |  |  |  |
Income tax provision components [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current payable: Federal |  |  |  |  |  |  |  |  | (448,000) | (5,030,000) | (607,000)
Current payable: State |  |  |  |  |  |  |  |  | 8,322,000 | 613,000 | 4,658,000
Net-deferred: Federal |  |  |  |  |  |  |  |  | 36,937,000 | 36,589,000 | 29,255,000
Net-deferred: State |  |  |  |  |  |  |  |  | 1,223,000 | 7,523,000 | 3,034,000
Amortized investment tax credits |  |  |  |  |  |  |  |  | (212,000) | (260,000) | (301,000)
Total income tax provision |  |  |  |  |  |  |  |  | 45,822,000 | 39,435,000 | 36,039,000
Reconciliation of tax provision to statutory federal income tax rate [Abstract] |  |  |  |  |  |  |  |  |  |  |
Statutory federal income tax rate |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
State income taxes, net of federal benefit |  |  |  |  |  |  |  |  | 5.10% | 5.00% | 5.10%
Amortized investment tax credits |  |  |  |  |  |  |  |  | (0.20%) | (0.20%) | (0.30%)
Credit for electricity from wind energy |  |  |  |  |  |  |  |  | (1.50%) | (1.50%) | (1.80%)
Domestic manufacturing deduction |  |  |  |  |  |  |  |  | (0.20%) | 0.30% | (0.70%)
AFUDC Equity, net |  |  |  |  |  |  |  |  | (0.70%) | (0.40%) | 0.00%
Other, net, individually significant |  |  |  |  |  |  |  |  | 0.00% | (0.50%) | (0.30%)
Effective income tax rate |  |  |  |  |  |  |  |  | 37.50% | 37.70% | 37.00%
Deferred tax liabilities (assets) on balance sheet [Abstract] |  |  |  |  |  |  |  |  |  |  |
Property-related | 263,881,000 |  |  |  | 248,545,000 |  |  |  | 263,881,000 | 248,545,000 |
Investment in ATC | 27,073,000 |  |  |  | 24,993,000 |  |  |  | 27,073,000 | 24,993,000 |
Bond transactions | 1,553,000 |  |  |  | 1,643,000 |  |  |  | 1,553,000 | 1,643,000 |
Pension and other postretirement benefits | 34,478,000 |  |  |  | 82,072,000 |  |  |  | 34,478,000 | 82,072,000 |
Derivatives | 26,361,000 |  |  |  | 29,134,000 |  |  |  | 26,361,000 | 29,134,000 |
Tax deductible prepayments | 7,508,000 |  |  |  | 7,233,000 |  |  |  | 7,508,000 | 7,233,000 |
Other deferred tax liabilities | 1,911,000 |  |  |  | 10,634,000 |  |  |  | 1,911,000 | 10,634,000 |
Gross deferred income tax liabilities | 362,765,000 |  |  |  | 404,254,000 |  |  |  | 362,765,000 | 404,254,000 |
Future federal tax benefit | 0 |  |  |  | (25,899,000) |  |  |  | 0 | (25,899,000) |
Accrued expenses | (17,195,000) |  |  |  | (30,228,000) |  |  |  | (17,195,000) | (30,228,000) |
Pension and other postretirement benefits | (26,838,000) |  |  |  | (69,941,000) |  |  |  | (26,838,000) | (69,941,000) |
Deferred tax regulatory account | (1,402,000) |  |  |  | (1,551,000) |  |  |  | (1,402,000) | (1,551,000) |
Derivatives | (26,361,000) |  |  |  | (29,134,000) |  |  |  | (26,361,000) | (29,134,000) |
Other deferred tax assets | (9,356,000) |  |  |  | (4,940,000) |  |  |  | (9,356,000) | (4,940,000) |
Gross deferred income tax assets | (81,152,000) |  |  |  | (161,693,000) |  |  |  | (81,152,000) | (161,693,000) |
Less valuation allowance | 195,000 |  |  |  | 365,000 |  |  |  | 195,000 | 365,000 |
Net deferred income tax assets | (80,957,000) |  |  |  | (161,328,000) |  |  |  | (80,957,000) | (161,328,000) |
Deferred income taxes | 281,808,000 |  |  |  | 242,926,000 |  |  |  | 281,808,000 | 242,926,000 |
Operating loss deductions and tax credit carryforwards [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforward | 0 |  |  |  | 64,200,000 |  |  |  | 0 | 64,200,000 |
Operating loss carryforward, deferred tax asset |  |  |  |  | 22,500,000 |  |  |  |  | 22,500,000 |
Tax credit carryforward, amount | 0 |  |  |  | 3,400,000 |  |  |  | 0 | 3,400,000 |
Tax credit carryforward, deferred tax asset |  |  |  |  | 3,400,000 |  |  |  |  | 3,400,000 |
State net tax operating loss deductions | $ 4,000,000 |  |  |  |  |  |  |  | $ 4,000,000 |  |

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