Summary of Significant Accounting Policies - Changes in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jan. 01, 2020
Accounting Policies [Abstract]
Receivable, threshold period past due	20 days	20 days
ACCOUNTS RECEIVABLE
Accounts receivable, beginning balance	$ 2,123	$ 3,005
Current period provision	1,137	3,634
Charge-offs		(4,091)
Recovery	226	867
Balances, June 30, 2020	3,486	3,486
OTHER
Financing receivable, beginning balance	1,638	1,250
Current period provision	0	388
Charge-offs		0
Recovery	0	0
Balances, June 30, 2020	1,638	1,638
TOTAL
Total, beginning balance	3,761	4,255
Current period provision	1,137	4,022
Charge-offs		(4,091)
Recovery	226	867
Balances, June 30, 2020	5,124	5,124
CLECO POWER
ACCOUNTS RECEIVABLE
Accounts receivable, beginning balance	2,123	3,005
Current period provision	1,137	3,634
Charge-offs		(4,091)
Recovery	226	867
Balances, June 30, 2020	3,486	3,486
Accounting Standards Update 2016-13
ACCOUNTS RECEIVABLE
CECL adoption	71	71	$ 100
TOTAL
CECL adoption	71	71	$ 100
Accounting Standards Update 2016-13 | CLECO POWER
ACCOUNTS RECEIVABLE
CECL adoption	71	71
TOTAL
CECL adoption	$ 71	$ 71