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Fair Value of Financial Instruments (Details-4) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance, $ (21,023) $ (33,337) $ (26,456) $ (32,002)
Realized and unrealized gains (losses):        
Included in regulatory assets 5,296 4,317 10,729 2,982
Included in other comprehensive income 0 0 0 0
Included in earnings [1] (1,524) (492) (4,687) (1,928)
Included in current assets (37) 4 (101) (198)
Purchases 5,505 5,205 15,837 16,827
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (3,944) (4,717) (11,049) (14,701)
Transfers in and/or out of level 3 0 0 0 0
Ending balance, $ (15,727) $ (29,020) $ (15,727) $ (29,020)
[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.