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Fair Value Accounting - Net Changes in Net Fair Value of FTR Assets and Liabilities Classified as Level 3 (Details) - Price Risk Derivative - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance $ 14,665 $ 25,133 $ 22,887 $ 7,044
Unrealized (losses) gains (1,234) 4,520 (4,488) 6,153
Purchases 557 1,251 26,401 26,734
Settlements (5,319) (8,644) (36,131) (17,671)
Ending balance 8,669 22,260 8,669 22,260
CLECO POWER        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance 13,910 25,133 22,887 7,044
Unrealized (losses) gains (1,700) 4,520 (3,644) 6,153
Purchases 1,133 1,251 20,961 26,734
Settlements (5,319) (8,644) (32,180) (17,671)
Ending balance $ 8,024 $ 22,260 $ 8,024 $ 22,260