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Fair Value Accounting -Net Changes in Net Fair Value of FTR Assets and Liabilities Classified as Level 3 (Details) - FTRs - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance $ 5,778 $ 22,887
Unrealized (losses) gains 187 (1,659)
Purchases 11,333 27,881
Settlements (14,118) (43,331)
Ending balance 3,180 5,778
CLECO POWER    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance 5,725 22,887
Unrealized (losses) gains 450 (945)
Purchases 9,378 21,609
Settlements (12,337) (37,826)
Ending balance $ 3,216 $ 5,725