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Fair Value Accounting - Amount of Gain (Loss) Recognized in Income on Derivatives (Details) - DERIVATIVES NOT DESIGNATED AS HEDGING INSTRUMENTS - Price Risk Derivative - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Commodity-related contracts        
Net gain (loss) recognized in income on derivatives $ 2,823 $ 5,654 $ 115 $ 29,119
Accumulated deferred fuel        
Commodity-related contracts        
Unrealized gains (losses) associated with FTRs (1,700) 4,500 (3,600) 6,200
Electric operations        
Commodity-related contracts        
Gain recognized in income on derivatives 1,997 7,241 12,396 32,407
Purchased power        
Commodity-related contracts        
Loss recognized in income on derivatives (2,648) (1,587) (12,985) (3,288)
Fuel used for electric generation        
Commodity-related contracts        
Gain recognized in income on derivatives 3,474 0 704 0
CLECO POWER        
Commodity-related contracts        
Net gain (loss) recognized in income on derivatives 169 5,654 7,600 29,119
CLECO POWER | Accumulated deferred fuel        
Commodity-related contracts        
Unrealized gains (losses) associated with FTRs (1,700) 4,500 (3,600) 6,200
CLECO POWER | Electric operations        
Commodity-related contracts        
Gain recognized in income on derivatives 1,997 7,241 12,400 32,407
CLECO POWER | Purchased power        
Commodity-related contracts        
Loss recognized in income on derivatives $ (1,828) $ (1,587) $ (4,800) $ (3,288)