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Summary of Significant Accounting Policies - Restricted Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Restricted Cash and Cash Equivalents [Abstract]    
Current $ 11,241 $ 13,081
Non-current 18,670 20,081
Total restricted cash and cash equivalents 29,911 33,162
Cleco Katrina/Rita’s storm recovery bonds    
Restricted Cash and Cash Equivalents [Abstract]    
Current 9,505 8,597
Cleco Power’s charitable contributions    
Restricted Cash and Cash Equivalents [Abstract]    
Current 1,200 1,200
Non-current 2,753 3,575
Cleco Power’s rate credit escrow    
Restricted Cash and Cash Equivalents [Abstract]    
Current 536 3,284
Non-current 505 2,029
Diversified Lands’ mitigation escrow    
Restricted Cash and Cash Equivalents [Abstract]    
Non-current 21 21
Cleco Power’s future storm restoration costs    
Restricted Cash and Cash Equivalents [Abstract]    
Non-current 15,391 14,456
Katrina Rita Bond Principal Payments    
Restricted Cash and Cash Equivalents [Abstract]    
Collections 22,700  
Katrina Rita Bond Interest Payments    
Restricted Cash and Cash Equivalents [Abstract]    
Payments 19,200  
Katrina/Rita Storm Recovery Collections, Net of Administration Fees    
Restricted Cash and Cash Equivalents [Abstract]    
Payments 2,600  
CLECO POWER    
Restricted Cash and Cash Equivalents [Abstract]    
Current 11,241 13,081
Non-current 18,649 20,060
Total restricted cash and cash equivalents 29,890 33,141
CLECO POWER | Cleco Katrina/Rita’s storm recovery bonds    
Restricted Cash and Cash Equivalents [Abstract]    
Current 9,505 8,597
CLECO POWER | Cleco Power’s charitable contributions    
Restricted Cash and Cash Equivalents [Abstract]    
Current 1,200 1,200
Non-current 2,753 3,575
CLECO POWER | Cleco Power’s rate credit escrow    
Restricted Cash and Cash Equivalents [Abstract]    
Current 536 3,284
Non-current 505 2,029
CLECO POWER | Cleco Power’s future storm restoration costs    
Restricted Cash and Cash Equivalents [Abstract]    
Non-current $ 15,391 $ 14,456