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Summary of Significant Accounting Policies, Restricted Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Restricted Cash and Cash Equivalents Items [Line Items]          
Current $ 3,702   $ 3,702   $ 8,986
Total non-current 15,878   15,878   15,130
Total restricted cash and cash equivalents 19,580   19,580   24,116
Cleco Katrina/Rita storm recovery bonds [Abstract]          
Increase (Decrease) in Cleco Katrina/Rita's storm recovery bonds     (4,536) $ 4,989  
Katrina Rita collections          
Cleco Katrina/Rita storm recovery bonds [Abstract]          
Increase (Decrease) in Cleco Katrina/Rita's storm recovery bonds     15,600    
Katrina Rita Bond Principal Payments          
Cleco Katrina/Rita storm recovery bonds [Abstract]          
Increase (Decrease) in Cleco Katrina/Rita's storm recovery bonds (7,700) $ (8,100)      
Katrina Rita Bond Interest Payments          
Cleco Katrina/Rita storm recovery bonds [Abstract]          
Increase (Decrease) in Cleco Katrina/Rita's storm recovery bonds (2,500) $ (2,600)      
Diversified Lands’ mitigation escrow          
Restricted Cash and Cash Equivalents Items [Line Items]          
Total non-current 21   21   21
Cleco Power’s future storm restoration costs          
Restricted Cash and Cash Equivalents Items [Line Items]          
Total non-current 15,857   15,857   14,915
Cleco Power’s building renovation escrow          
Restricted Cash and Cash Equivalents Items [Line Items]          
Total non-current $ 0   $ 0   $ 194