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Fair Value Accounting - Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - Price Risk Derivative - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance $ 7,044 $ 7,683
Unrealized gains (losses) 11,865 (1,392)
Purchases 28,185 23,941
Settlements (24,207) (23,188)
Ending balance 22,887 7,044
CLECO POWER    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance 7,044 7,683
Unrealized gains (losses) 11,865 (1,392)
Purchases 28,185 23,941
Settlements (24,207) (23,188)
Ending balance $ 22,887 $ 7,044