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Regulatory Assets and Liabilities, Additional Disclosures (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Regulatory Assets [Line Items]      
Decrease in fuel and purchased power costs   $ 7,251 $ (25,971)
Cleco Power [Member]      
Regulatory Assets [Line Items]      
Decrease in fuel and purchased power costs   $ 7,251 $ (25,971)
Fuel and purchased power | Cleco Power [Member]      
Regulatory Assets [Line Items]      
Percentage of total fuel cost regulated by LPSC (in hundredths) 76.00% 75.00%  
Decrease in under recovered costs   $ 12,500  
Decrease in fuel and purchased power costs   6,100  
decrease due to the settlement of previously open FTR positions and a mark-to-market gain on current open FTR positions   $ 6,400