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Commitments and Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract] |
Purchase Contracts, Fiscal Year Maturity Schedule | As of June 30, 2016, the future commitments related to these purchase contracts were as follows:
| (In thousands) |  | 2016 |  | 2017 |  | 2018 |  | 2019 |  | 2020 |  | Thereafter |
| Natural gas |  |  |  |  |  |  |  |  |  |  |  |  |
| Transportation & storage(a) | $ | 10,621 | $ | 25,044 | $ | 24,833 | $ | 23,048 | $ | 16,274 | $ | 32,595 |
| Supply(b) |  | 11,035 |  | 13,092 |  | - |  | - |  | - |  | - |
|  | $ | 21,656 | $ | 38,136 | $ | 24,833 | $ | 23,048 | $ | 16,274 | $ | 32,595 |
(a) MGE's natural gas transportation and storage contracts require fixed monthly payments for firm supply pipeline transportation and storage capacity. The pricing components of the fixed monthly payments for the transportation and storage contracts are established by FERC but may be subject to change. Management expects to recover these costs in future customer rates. (b) These commitments include market-based pricing. Management expects to recover these costs in future customer rates.

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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