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Fair Value Accounting and Financial Instruments - Net Changes in Net Fair Value of FTR Assets and Liabilities Classified as Level 3 (Details) - Price risk derivatives - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance $ 7,501 $ 8,040 $ 3,180 $ 5,778
Unrealized gains (losses) 3,955 4 18,861 (736)
Purchases 619 443 11,426 10,175
Settlements (4,326) (3,160) (25,718) (9,890)
Ending balance 7,749 5,327 7,749 5,327
CLECO POWER        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance 5,990 7,511 3,216 5,725
Unrealized gains (losses) 1,196 426 545 1,355
Purchases 619 443 9,236 8,219
Settlements (3,107) (2,968) (8,299) (9,887)
Ending balance $ 4,698 $ 5,412 $ 4,698 $ 5,412