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Fair Value Accounting - Net Changes in Net Fair Value of FTR Assets and Liabilities Classified as Level 3 (Details) - Commodity-related contracts - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance $ 1,023 $ 1,096 $ 3,180 $ 5,778
Unrealized gains (losses) (1,005) (284) 15,155 (371)
Purchases 9,958 9,267 10,806 9,732
Settlements (2,475) (2,039) (21,640) (7,099)
Ending balance 7,501 8,040 7,501 8,040
CLECO POWER        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance 1,088 1,149 3,216 5,725
Unrealized gains (losses) (402) 1,298 (402) 1,298
Purchases 7,768 7,311 8,616 7,776
Settlements (2,464) (2,247) (5,440) (7,288)
Ending balance $ 5,990 $ 7,511 $ 5,990 $ 7,511