Fair Value Accounting - Fair Value of Derivative Instruments as Recorded in Condensed Consolidated Balance Sheets (Details) - Price Risk Derivative - DERIVATIVES NOT DESIGNATED AS HEDGING INSTRUMENTS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Commodity-related contracts
FTRs in energy risk management assets	$ 9,171	$ 23,355
FTRs in energy risk management liabilities	1,361	468
Commodity-related contracts, net	7,810	22,887
CLECO POWER
Commodity-related contracts
FTRs in energy risk management assets	5,684	23,355
FTRs in energy risk management liabilities	872	468
Commodity-related contracts, net	$ 4,812	$ 22,887