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Summary of Significant Accounting Policies, Restricted Cash (Details) (USD $)
3 Months Ended 12 Months Ended
Sep. 30, 2011
Mar. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Restricted Cash [Abstract]        
Restricted cash     $ 35,828,000 $ 41,048,000
Diversified Lands Mitigation Escrow Agreement [Member]
       
Restricted Cash [Abstract]        
Restricted cash     97,000 97,000
Katrina/Rita Bond Payments [Member]
       
Restricted Cash [Abstract]        
Restricted cash     8,761,000 8,822,000
Collection net of operating expenses     19,700,000  
Bond principal payments 6,000,000 6,300,000    
Bond interest payments 3,700,000 3,800,000    
Future Storm Restoration Costs [Member]
       
Restricted Cash [Abstract]        
Restricted cash     24,876,000 25,992,000
Renewable Energy Grant [Member]
       
Restricted Cash [Abstract]        
Restricted cash     381,000 0
GO Zone Project Costs [Member]
       
Restricted Cash [Abstract]        
Restricted cash     0 6,137,000
Nox Allowance Escrow [Member]
       
Restricted Cash [Abstract]        
Restricted cash     1,713,000 0
Cleco Power [Member]
       
Restricted Cash [Abstract]        
Renewable energy grant     $ 600,000