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Regulatory Assets and Liabilities, Additional Disclosures (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Regulatory Assets [Line Items]      
Increase of higher volumes and the timing and collection of fuel expenses   $ (1,010) $ 23,908
Cleco Power [Member]      
Regulatory Assets [Line Items]      
Increase of higher volumes and the timing and collection of fuel expenses   $ (1,010) $ 23,908
Fuel and purchased power | Cleco Power [Member]      
Regulatory Assets [Line Items]      
Percentage of total fuel cost regulated by LPSC (in hundredths) 73.00% 74.00%  
Decrease in fuel and purchased power   $ 2,900  
Decrease in the mark-to-market value of the FTRs   3,700  
Increase of higher volumes and the timing and collection of fuel expenses   $ 800