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Regulatory Assets and Liabilities - Narrative (Details) - CLECO POWER - USD ($)
$ in Thousands
1 Months Ended
Feb. 04, 2019
Jan. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Regulatory Assets [Line Items]        
Regulatory liability     $ 1,700  
Annual reduction to retail customer rates $ 4,000 $ 4,000    
Energy efficiency        
Regulatory Assets [Line Items]        
Regulatory liability     $ 1,463  
Energy efficiency        
Regulatory Assets [Line Items]        
Reversal of regulatory asset       $ (2,585)
Reversal | Energy efficiency        
Regulatory Assets [Line Items]        
Reversal of regulatory asset       $ 2,600