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Fair Value Accounting - Commodity Contracts (Details)
$ in Thousands, MWh in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
MWh
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
MWh
Price Risk Derivative | Derivatives Not Designated As Hedging Instrument          
Commodity-related contracts          
Commodity-related contracts, net $ 25,133   $ 25,133   $ 7,044
Commodity contracts          
Net gain (loss) on FTRs recognized in income 10,814 $ 5,620 23,298 $ 10,118  
Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Energy risk management assets          
Commodity-related contracts          
FTRs in energy risk management assets 26,077   26,077   7,396
Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Other current liabilities          
Commodity-related contracts          
FTRs in Energy risk management liabilities 944   944   $ 352
Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Accumulated deferred fuel          
Commodity contracts          
Unrealized gains (losses) associated with FTRs not recognized in income on derivatives 2,400 (2,500) 2,400 (2,500)  
Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Electric operations          
Commodity contracts          
Gain on FTRs recognized in income 17,841 11,947 35,991 21,110  
Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Power purchased for utility customers          
Commodity contracts          
Loss on FTRs recognized in income $ (7,027) $ (6,327) $ (12,693) $ (10,992)  
CLECO POWER          
Commodity contracts          
Volume of FTRs Held (MWh) | MWh     19.3   9.0