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Investments (Tables) | 12 Months Ended
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Dec. 31, 2013
Investments Disclosure [Abstract] |
Equity Method, Available for Sale Securities, and Other Investments |
|  |  | MGE Energy |  |  | MGE |
| (In thousands) |  | 2013 |  | 2012 |  |  | 2013 |  | 2012 |
| Available for sale securities: |  |  |  |  |  |  |  |  |  |
| Cost basis | $ | 1,736 | $ | 1,575 |  | $ | 490 | $ | 490 |
| Gross unrealized gains |  | 629 |  | 161 |  |  | 321 |  | 10 |
| Gross unrealized losses |  | 0 |  | (3) |  |  | 0 |  | (3) |
| Fair value | $ | 2,365 | $ | 1,733 |  | $ | 811 | $ | 497 |
| Equity method investments: |  |  |  |  |  |  |  |  |  |
| ATC | $ | 64,488 | $ | 61,038 |  | $ | 64,488 | $ | 61,038 |
| Other |  | 1,099 |  | 20 |  |  | 0 |  | 20 |
| Total equity method investments | $ | 65,587 | $ | 61,058 |  | $ | 64,488 | $ | 61,058 |
| Other investments |  | 0 |  | 1,804 |  |  | 0 |  | 0 |
| Total | $ | 67,952 | $ | 64,595 |  | $ | 65,299 | $ | 61,555 |
During the year ended December 31, certain inves tments were liquidated. As a result of these liqu idations, MGE Energy and MGE received the following:
|  |  | MGE Energy |  | MGE |
| (In thousands) |  | 2013 |  | 2012 |  | 2011 |  | 2013 |  | 2012 |  | 2011 |
| Cash proceeds | $ | 39 | $ | 0 | $ | 260 | $ | 16 | $ | 0 | $ | 223 |
| Gain (loss) on sale |  | 2 |  | 0 |  | 198 |  | (3) |  | 0 |  | 171 |
ATC's Summarized Financial Data | ATC's summarized financial data for the years ended December 31, 2013, 2012, and 2011 is as follows:
| (In thousands) |  |  |  |  |  |  |
| Income statement data for the year ended December 31, |  | 2013 |  | 2012 |  | 2011 |
| Operating revenues | $ | 626,336 | $ | 603,254 | $ | 567,174 |
| Operating expenses |  | (295,069) |  | (280,999) |  | (261,568) |
| Other income (expense) |  | 831 |  | (2,533) |  | (1,332) |
| Interest expense, net |  | (84,484) |  | (82,296) |  | (80,359) |
| Earnings before members' income taxes | $ | 247,614 | $ | 237,426 | $ | 223,915 |
| Balance sheet data as of December 31, |  | 2013 |  | 2012 |  | 2011 |
| Current assets | $ | 80,715 | $ | 63,134 | $ | 58,671 |
| Noncurrent assets |  | 3,509,517 |  | 3,274,704 |  | 3,053,742 |
| Total assets | $ | 3,590,232 | $ | 3,337,838 | $ | 3,112,413 |
| Current liabilities | $ | 381,467 | $ | 251,541 | $ | 298,473 |
| Long-term debt |  | 1,550,000 |  | 1,550,000 |  | 1,400,005 |
| Other noncurrent liabilities |  | 126,167 |  | 95,829 |  | 82,647 |
| Members' equity |  | 1,532,598 |  | 1,440,468 |  | 1,331,288 |
| Total members' equity and liabilities | $ | 3,590,232 | $ | 3,337,838 | $ | 3,112,413 |

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- Definition Tabular disclosure of equity method investments in common stock, available for sale securities and other investments. The equity method investments disclosure may include: (a) the name of each investee or group of investments for which combined disclosure is appropriate, (2) the percentage ownership of common stock, (3) the difference, if any, between the carrying amount of an investment and the value of the underlying equity in the net assets and the accounting treatment of difference, if any, and (4) the aggregate value of each identified investment based on its quoted market price, if available. The available for sale securities disclosure includes a tabular disclosure of the reconciliation of available for sale securities from cost basis to fair value. + References No definition available. + Details
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- Definition Tabular disclosure of equity method investments in common stock. The disclosure may include: (a) the name of each investee or group of investments for which combined disclosure is appropriate, (2) the percentage ownership of common stock, (3) the difference, if any, between the carrying amount of an investment and the value of the underlying equity in the net assets and the accounting treatment of difference, if any, and (4) the aggregate value of each identified investment based on its quoted market price, if available. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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