Leases - Lease Income Under Cottonwood Sale Leaseback (Details) - Cleco Cajun - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lessor, Lease, Description [Line Items]
Fixed payments	$ 10,000	$ 10,000	$ 30,000	$ 26,667
Variable payments	5,190	6,010	15,950	14,248
Amortization of deferred lease liability	2,301	2,301	6,904	6,137
Total lease income	$ 17,491	$ 18,311	$ 52,854	$ 47,052