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Fair Value of Financial Instruments (Details-2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Assets: |  |  |
Available-for-sale securities | $ 2,365 |  | $ 1,733
Liabilities: |  |  |
Derivative asset, collateral offset | 200 |  | 0
Recurring [Member] |  |  |
Assets: |  |  |
Total Assets | 792 |  | 320
Liabilities: |  |  |
Derivatives, net | 63,893 | [1] | 72,329
Deferred compensation | 2,364 |  | 2,010
Total Liabilities | 66,257 |  | 74,339
Recurring [Member] | Exchange-traded investments |  |  |
Assets: |  |  |
Available-for-sale securities | 792 |  | 320
Recurring [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Total Assets | 792 |  | 320
Liabilities: |  |  |
Derivatives, net | (735) | [1] | (17)
Deferred compensation | 0 |  | 0
Total Liabilities | (735) |  | (17)
Recurring [Member] | Level 1 [Member] | Exchange-traded investments |  |  |
Assets: |  |  |
Available-for-sale securities | 792 |  | 320
Recurring [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Total Assets | 0 |  | 0
Liabilities: |  |  |
Derivatives, net | 0 | [1] | 0
Deferred compensation | 2,364 |  | 2,010
Total Liabilities | 2,364 |  | 2,010
Recurring [Member] | Level 2 [Member] | Exchange-traded investments |  |  |
Assets: |  |  |
Available-for-sale securities | 0 |  | 0
Recurring [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Total Assets | 0 |  | 0
Liabilities: |  |  |
Derivatives, net | 64,628 | [1] | 72,346
Deferred compensation | 0 |  | 0
Total Liabilities | 64,628 |  | 72,346
Recurring [Member] | Level 3 [Member] | Exchange-traded investments |  |  |
Assets: |  |  |
Available-for-sale securities | 0 |  | 0
MGE [Member] |  |  |
Assets: |  |  |
Available-for-sale securities | 811 |  | 497
Liabilities: |  |  |
Derivative asset, collateral offset | 200 |  |
MGE [Member] | Recurring [Member] |  |  |
Assets: |  |  |
Total Assets | 431 |  | 117
Liabilities: |  |  |
Derivatives, net | 63,893 | [1] | 72,329
Deferred compensation | 2,364 |  | 2,010
Total Liabilities | 66,257 |  | 74,339
MGE [Member] | Recurring [Member] | Exchange-traded investments |  |  |
Assets: |  |  |
Available-for-sale securities | 431 |  | 117
MGE [Member] | Recurring [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Total Assets | 431 |  | 117
Liabilities: |  |  |
Derivatives, net | (735) | [1] | (17)
Deferred compensation | 0 |  | 0
Total Liabilities | (735) |  | (17)
MGE [Member] | Recurring [Member] | Level 1 [Member] | Exchange-traded investments |  |  |
Assets: |  |  |
Available-for-sale securities | 431 |  | 117
MGE [Member] | Recurring [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Total Assets | 0 |  | 0
Liabilities: |  |  |
Derivatives, net | 0 | [1] | 0
Deferred compensation | 2,364 |  | 2,010
Total Liabilities | 2,364 |  | 2,010
MGE [Member] | Recurring [Member] | Level 2 [Member] | Exchange-traded investments |  |  |
Assets: |  |  |
Available-for-sale securities | 0 |  | 0
MGE [Member] | Recurring [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Total Assets | 0 |  | 0
Liabilities: |  |  |
Derivatives, net | 64,628 | [1] | 72,346
Deferred compensation | 0 |  | 0
Total Liabilities | 64,628 |  | 72,346
MGE [Member] | Recurring [Member] | Level 3 [Member] | Exchange-traded investments |  |  |
Assets: |  |  |
Available-for-sale securities | $ 0 |  | $ 0
[1] | These amounts are shown gross and exclude $0.2 million of collateral that was posted against derivative positions with counterparties.

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