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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, 2019
Dec. 31, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance $ 22,887 $ 7,044
Unrealized (losses) gains (1,659) 11,865
Purchases 27,881 28,185
Settlements (43,331) (24,207)
Ending balance 5,778 22,887
CLECO POWER    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance 22,887 7,044
Unrealized (losses) gains (945) 11,865
Purchases 21,609 28,185
Settlements (37,826) (24,207)
Ending balance $ 5,725 $ 22,887