Leases - Future Minimum Lease Payments Due Under Long-Term Operating Leases (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Nine months ending Dec. 31, 2019	$ 4,773
Years ending Dec. 31,
2020	5,952
2021	4,626
2022	3,256
2023	3,229
Thereafter	25,172
Total minimum lease payments	47,008
Less: amount representing interest	31,689
Present value of net minimum operating lease payments	15,319
Current liabilities	3,685
Non-current liabilities	11,634
CLECO POWER
Lessee, Lease, Description [Line Items]
Nine months ending Dec. 31, 2019	4,598
Years ending Dec. 31,
2020	5,918
2021	4,593
2022	3,225
2023	3,201
Thereafter	25,150
Total minimum lease payments	46,685
Less: amount representing interest	31,678
Present value of net minimum operating lease payments	15,007
Current liabilities	3,518
Non-current liabilities	$ 11,489