Leases - Lease Income Under Cottonwood Sale Leaseback (Details) - Cleco Cajun - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Lessor, Lease, Description [Line Items]
Fixed payments	$ 10,000	$ 10,000
Variable payments	5,465	5,566
Amortization of deferred lease liability	2,301	2,302
Total lease income	$ 17,766	$ 17,868