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Fair Value of Financial Instruments (Details-2) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |  |
Available-for-sale securities | $ 14,546 |  | $ 9,363
Liabilities: |  |  |
Collateral posted against derivative positions | 1,500 |  |
Recurring [Member] |  |  |
Assets: |  |  |
Derivative assets, net | 303 |  | 1,042
Total Assets | 1,574 |  | 1,890
Liabilities: |  |  |
Derivative liabilities, net | 27,178 | [1] | 32,872
Deferred compensation | 3,157 |  | 3,078
Total Liabilities | 30,335 |  | 35,950
Recurring [Member] | Exchange-traded investments |  |  |
Assets: |  |  |
Available-for-sale securities | 1,271 |  | 848
Recurring [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Derivative assets, net | 189 |  | 296
Total Assets | 1,460 |  | 1,144
Liabilities: |  |  |
Derivative liabilities, net | 608 | [1] | 124
Deferred compensation | 0 |  | 0
Total Liabilities | 608 |  | 124
Recurring [Member] | Level 1 [Member] | Exchange-traded investments |  |  |
Assets: |  |  |
Available-for-sale securities | 1,271 |  | 848
Recurring [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Derivative assets, net | 0 |  | 0
Total Assets | 0 |  | 0
Liabilities: |  |  |
Derivative liabilities, net | 0 | [1] | 0
Deferred compensation | 3,157 |  | 3,078
Total Liabilities | 3,157 |  | 3,078
Recurring [Member] | Level 2 [Member] | Exchange-traded investments |  |  |
Assets: |  |  |
Available-for-sale securities | 0 |  | 0
Recurring [Member] | Level 3 [Member] |  |  |
Assets: |  |  |
Derivative assets, net | 114 |  | 746
Total Assets | 114 |  | 746
Liabilities: |  |  |
Derivative liabilities, net | 26,570 | [1] | 32,748
Deferred compensation | 0 |  | 0
Total Liabilities | 26,570 |  | 32,748
Recurring [Member] | Level 3 [Member] | Exchange-traded investments |  |  |
Assets: |  |  |
Available-for-sale securities | 0 |  | 0
MGE [Member] |  |  |
Assets: |  |  |
Available-for-sale securities | 209 |  | 388
Liabilities: |  |  |
Collateral posted against derivative positions | 0 |  | 100
MGE [Member] | Recurring [Member] |  |  |
Assets: |  |  |
Derivative assets, net | 303 |  | 1,042
Total Assets | 512 |  | 1,085
Liabilities: |  |  |
Derivative liabilities, net | 27,178 | [1] | 32,872
Deferred compensation | 3,157 |  | 3,078
Total Liabilities | 30,335 |  | 35,950
MGE [Member] | Recurring [Member] | Exchange-traded investments |  |  |
Assets: |  |  |
Available-for-sale securities | 209 |  | 43
MGE [Member] | Recurring [Member] | Level 1 [Member] |  |  |
Assets: |  |  |
Derivative assets, net | 189 |  | 296
Total Assets | 398 |  | 339
Liabilities: |  |  |
Derivative liabilities, net | 608 | [1] | 124
Deferred compensation | 0 |  | 0
Total Liabilities | 608 |  | 124
MGE [Member] | Recurring [Member] | Level 1 [Member] | Exchange-traded investments |  |  |
Assets: |  |  |
Available-for-sale securities | 209 |  | 43
MGE [Member] | Recurring [Member] | Level 2 [Member] |  |  |
Assets: |  |  |
Derivative assets, net | 0 |  | 0
Total Assets | 0 |  | 0
Liabilities: |  |  |
Derivative liabilities, net | 0 | [1] | 0
Deferred compensation | 3,157 |  | 3,078
Total Liabilities | 3,157 |  | 3,078
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: |  |  |
Derivative assets, net | 114 |  | 746
Total Assets | 114 |  | 746
Liabilities: |  |  |
Derivative liabilities, net | 26,570 | [1] | 32,748
Deferred compensation | 0 |  | 0
Total Liabilities | 26,570 |  | 32,748
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 $1.5 million of collateral that was posted against derivative positions with counterparties as of December 31, 2019.

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