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Investment in ATC (Tables) | 6 Months Ended
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Jun. 30, 2016
Equity Method Investments and Joint Ventures [Abstract] |
ATC's Summarized Financial Data | For the three and six months ended June 30, 2016 and 2015, MGE Transco recorded the following:
|  |  | Three Months Ended |  | Six Months Ended |
|  |  | June 30, |  | June 30, |
| (In thousands) |  | 2016 |  | 2015 |  | 2016 |  | 2015 |
| Equity in earnings from investment in ATC | $ | 1,767 | $ | 2,289 | $ | 4,000 | $ | 4,170 |
| Dividends received from ATC |  | 1,863 |  | 1,471 |  | 2,728 |  | 2,891 |
| Capital contributions to ATC |  | 177 |  | 177 |  | 710 |  | 355 |
ATC's summarized financial data for the three and six months ended June 30, 2016 and 2015, is as follows:
|  |  | Three Months Ended |  | Six Months Ended |
|  |  | June 30, |  | June 30, |
| (In thousands) |  | 2016 |  | 2015 |  | 2016 |  | 2015 |
| Operating revenues | $ | 154,225 | $ | 165,171 | $ | 318,465 | $ | 317,528 |
| Operating expenses |  | (81,698) |  | (80,326) |  | (160,763) |  | (160,277) |
| Other income (expense), net |  | 1,308 |  | (81) |  | 1,435 |  | (19) |
| Interest expense, net |  | (24,882) |  | (24,172) |  | (49,090) |  | (48,655) |
| Earnings before members' income taxes | $ | 48,953 | $ | 60,592 | $ | 110,047 | $ | 108,577 |

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + 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 + Details
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