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Notes Payable to Banks, Commercial Paper, and Lines of Credit (Tables) | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Schedule of Short-Term Borrowings | Information concerning short-term borrowings for the past three years is shown below:
|  |  | As of December 31, |
| (In thousands) |  | 2015 |  | 2014 |  | 2013 |
| MGE Energy(a) |  |  |  |  |  |  |
| Available lines of credit | $ | 150,000 | $ | 150,000 | $ | 150,000 |
| Short-term debt outstanding | $ | - | $ | 7,000 | $ | - |
| Weighted-average interest rate |  | -% |  | 0.20% |  | -% |
| During the year: |  |  |  |  |  |  |
| Maximum short-term borrowings | $ | 17,500 | $ | 9,000 | $ | 32,000 |
| Average short-term borrowings | $ | 1,511 | $ | 182 | $ | 6,992 |
| Weighted-average interest rate |  | 0.17% |  | 0.24% |  | 0.18% |
| MGE |  |  |  |  |  |  |
| Available lines of credit | $ | 100,000 | $ | 100,000 | $ | 100,000 |
| Commercial paper outstanding | $ | - | $ | 7,000 | $ | - |
| Weighted-average interest rate |  | -% |  | 0.20% |  | -% |
| During the year: |  |  |  |  |  |  |
| Maximum short-term borrowings | $ | 17,500 | $ | 9,000 | $ | 32,000 |
| Average short-term borrowings | $ | 1,511 | $ | 182 | $ | 6,992 |
| Weighted-average interest rate |  | 0.17% |  | 0.24% |  | 0.18% |
(a) MGE Energy short-term borrowings include MGE Energy and MGE lines of credit and MGE commercial paper.

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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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