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Fair Value of Financial Instruments (Details-4) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance, $ (26,456) $ (32,002)
Realized and unrealized gains (losses):    
Included in regulatory assets 810 719
Included in other comprehensive income 0 0
Included in earnings [1] (1,453) (644)
Included in current assets 247 173
Purchases 5,015 5,765
Sales 0 0
Issuances 0 0
Settlements (3,810) (5,294)
Ending balance, $ (25,647) $ (31,283)
[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.