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Fair Value of Financial Instruments (Details-4) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance, $ (32,002) $ (42,026)
Realized and unrealized gains (losses):    
Included in regulatory assets 719 563
Included in other comprehensive income 0 0
Included in earnings [1] (644) (542)
Included in current assets 173 (173)
Purchases 5,765 5,834
Sales 0 0
Issuances 0 0
Settlements (5,294) (5,119)
Transfers in and/or out of level 3 0 0
Ending balance, (31,283) (41,463)
Total gains (losses) included in earnings attributed to the change in unrealized gains (losses) related to assets and liabilities [1] 0 0
Purchased Power Expense [Member]    
Realized and unrealized gains (losses):    
Included in earnings [1] (556) (723)
Cost Of Gas Sold Expense [Member]    
Realized and unrealized gains (losses):    
Included in earnings [1] $ (88) $ 181
[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.