Leases - Future Minimum Lease Payments Due Under Long-Term Operating Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Three months ending Dec. 31, 2019	$ 1,065
Years ending Dec. 31,
2020	3,994
2021	3,443
2022	3,287
2023	3,249
Thereafter	21,853
Total minimum lease payments	36,891
Less: amount representing interest	7,358
Present value of net minimum operating lease payments	29,533
Current liabilities	3,705
Non-current liabilities	25,828	$ 0
CLECO POWER
Lessee, Lease, Description [Line Items]
Three months ending Dec. 31, 2019	1,014
Years ending Dec. 31,
2020	3,960
2021	3,410
2022	3,256
2023	3,220
Thereafter	21,833
Total minimum lease payments	36,693
Less: amount representing interest	7,395
Present value of net minimum operating lease payments	29,298
Current liabilities	3,616
Non-current liabilities	$ 25,682	$ 0