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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, 2019
Mar. 31, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance $ 22,887 $ 7,044
Unrealized (losses) gains (1,917) 1,617
Purchases 5,237 371
Settlements (18,397) (4,749)
Ending balance 7,810 4,283
CLECO POWER    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance 22,887 7,044
Unrealized (losses) gains (2,939) 1,617
Purchases 1,286 371
Settlements (16,422) (4,749)
Ending balance $ 4,812 $ 4,283