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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
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Commodity contracts      
Net gain (loss) recognized in income on derivatives $ 1,885   $ 12,586
Accumulated deferred fuel      
Commodity contracts      
Unrealized gains (losses) associated with FTRs (2,900)   1,600
Electric operations      
Commodity contracts      
Gain recognized in income on derivatives 5,209   13,099
Power purchased for utility customers      
Commodity contracts      
Loss recognized in income on derivatives (3,324)   (513)
CLECO POWER      
Commodity contracts      
Net gain (loss) recognized in income on derivatives 3,223   12,586
CLECO POWER | Accumulated deferred fuel      
Commodity contracts      
Unrealized gains (losses) associated with FTRs (2,900) $ 1,600  
CLECO POWER | Electric operations      
Commodity contracts      
Gain recognized in income on derivatives 5,206   13,099
CLECO POWER | Power purchased for utility customers      
Commodity contracts      
Loss recognized in income on derivatives $ (1,983)   $ (513)