Leases - Supplemental Balance Sheet and Cash Flow Information and Other Supplemental Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
ROU assets
Operating	$ 14,618	$ 14,618
Finance	15,400	15,400
Total ROU assets	30,018	30,018
Current lease liabilities
Operating	3,776	3,776
Finance	586	586
Non-current lease liabilities
Operating	10,746	10,746
Finance	15,561	15,561
Total lease liabilities	30,669	30,669
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	1,214	2,279
Operating cash flows from finance leases	413	830
Financing cash flows from finance leases	137	271
ROU assets obtained in exchange for new lease liabilities	$ 0	$ 132
Operating leases
Weighted-average remaining lease term	7 years 4 months	7 years 4 months
Weighted-average discount rate	4.38%	4.38%
Finance leases
Weighted-average remaining lease term	13 years 9 months	13 years 9 months
Weighted-average discount rate	10.18%	10.18%
CLECO POWER
ROU assets
Operating	$ 14,352	$ 14,352
Finance	15,400	15,400	$ 15,960
Total ROU assets	29,752	29,752
Current lease liabilities
Operating	3,640	3,640
Finance	586	586
Non-current lease liabilities
Operating	10,598	10,598
Finance	15,561	15,561
Total lease liabilities	30,385	30,385
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	1,141	2,155
Operating cash flows from finance leases	413	830
Financing cash flows from finance leases	$ 137	$ 271
Operating leases
Weighted-average remaining lease term	7 years 5 months	7 years 5 months
Weighted-average discount rate	4.38%	4.38%
Finance leases
Weighted-average remaining lease term	13 years 9 months	13 years 9 months
Weighted-average discount rate	10.18%	10.18%