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Fair Value of Financial Instruments (Details-4) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance, $ (31,283) $ (41,463) $ (32,002) $ (42,026)
Realized and unrealized gains (losses):        
Included in regulatory assets (2,054) 4,130 (1,335) 4,693
Included in other comprehensive income 0 0 0 0
Included in earnings (792) 82 (1,436) [1] (460) [1]
Included in current assets (376) (297) (203) (470)
Purchases 5,858 6,032 11,623 11,866
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (4,690) (5,816) (9,984) (10,935)
Transfers in and/or out of level 3 0 0 0 0
Ending balance, $ (33,337) $ (37,332) $ (33,337) $ (37,332)
[1] MGE's exchange-traded derivative contracts, over-the-counter party transactions, purchased power agreement, and FTRs are subject to regulatory deferral. These derivatives are therefore marked to fair value and are offset in the financial statements with a corresponding regulatory asset or liability.