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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
Mar. 31, 2020
Mar. 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 (1,398) (1,917)
Purchases 466 5,237
Settlements (3,750) (18,397)
Ending balance 1,096 7,810
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 (1,311) (2,939)
Purchases 466 1,286
Settlements (3,731) (16,422)
Ending balance $ 1,149 $ 4,812