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Fair Value Accounting, Commodity Contracts (Details)
$ in Thousands, MWh in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 12, 2016
USD ($)
Dec. 31, 2016
USD ($)
MWh
MMBTU
Dec. 31, 2016
USD ($)
MWh
MMBTU
Dec. 31, 2015
USD ($)
MWh
MMBTU
Dec. 31, 2014
USD ($)
Price Risk Derivative [Member] | Cleco Power [Member] | Derivatives Not Designated as Hedging Instrument [Member]          
FTRs, at Fair Value, Net [Abstract]          
Commodity-related contracts, net   $ 7,683 $ 7,683 $ 7,398  
FTRs [Abstract]          
Net gain (loss) on FTRs recognized in income     18,776 23,085 $ 28,068
Price Risk Derivative [Member] | Cleco Power [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Accumulated deferred fuel [Member]          
FTRs [Abstract]          
Derivative, Unrealized Gain (Loss) On Derivative, Net     2,100 (1,500) (2,700)
Price Risk Derivative [Member] | Cleco Power [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Power purchased for utility customers [Member]          
FTRs [Abstract]          
Loss on FTRs recognized in income     (20,702) 27,509 46,386
Price Risk Derivative [Member] | Cleco Power [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Electric operations [Member]          
FTRs [Abstract]          
Gain on FTRs recognized in income     $ 39,478 $ 50,594 74,454
ERROR in label resolution. | Cleco Power [Member]          
FTRs [Abstract]          
Number of open natural gas positions | MMBTU   0 0 0  
Cleco Power [Member]          
FTRs [Abstract]          
Number of FTRs Held (MWh) | MWh   9.0 9.0 8.4  
Predecessor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member]          
FTRs, at Fair Value, Net [Abstract]          
Commodity-related contracts, net       $ 7,398  
FTRs [Abstract]          
Net gain (loss) on FTRs recognized in income $ 2,802     23,085 28,068
Predecessor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Accumulated deferred fuel [Member]          
FTRs [Abstract]          
Derivative, Unrealized Gain (Loss) On Derivative, Net (1,000)     (1,500) (2,700)
Predecessor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Energy risk management asset [Member]          
FTRs, at Fair Value, Net [Abstract]          
FTRs in Energy risk management assets       7,673  
Predecessor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Energy risk management liabilities [Member]          
FTRs, at Fair Value, Net [Abstract]          
FTRs in Energy risk management liabilities       275  
Predecessor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Power purchased for utility customers [Member]          
FTRs [Abstract]          
Loss on FTRs recognized in income (5,761)     (27,509) (46,386)
Predecessor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Electric operations [Member]          
FTRs [Abstract]          
Gain on FTRs recognized in income $ 8,563     50,594 $ 74,454
Successor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member]          
FTRs, at Fair Value, Net [Abstract]          
Commodity-related contracts, net   $ 7,683 $ 7,683    
FTRs [Abstract]          
Net gain (loss) on FTRs recognized in income   15,974      
Successor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Accumulated deferred fuel [Member]          
FTRs [Abstract]          
Derivative, Unrealized Gain (Loss) On Derivative, Net   3,100      
Successor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Energy risk management asset [Member]          
FTRs, at Fair Value, Net [Abstract]          
FTRs in Energy risk management assets   7,884 7,884    
Successor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Energy risk management liabilities [Member]          
FTRs, at Fair Value, Net [Abstract]          
FTRs in Energy risk management liabilities   201 201    
Successor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Power purchased for utility customers [Member]          
FTRs [Abstract]          
Loss on FTRs recognized in income   (14,941)      
Successor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Electric operations [Member]          
FTRs [Abstract]          
Gain on FTRs recognized in income   30,915      
Significant Unobservable Inputs (Level 3) [Member] | Measured On A Recurring Basis [Member] | Price Risk Derivative [Member] | Cleco Power [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Energy risk management asset [Member]          
FTRs, at Fair Value, Net [Abstract]          
FTRs in Energy risk management assets   7,884 7,884 7,673  
Significant Unobservable Inputs (Level 3) [Member] | Measured On A Recurring Basis [Member] | Price Risk Derivative [Member] | Cleco Power [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Energy risk management liabilities [Member]          
FTRs, at Fair Value, Net [Abstract]          
FTRs in Energy risk management liabilities   $ 201 $ 201 $ 275