Schedule II - Valuation And Qualifying Accounts And Reserves (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 2,821	$ 2,830	$ 2,365
Charged to Income	4,760	6,008	5,854
Net Write-offs	5,528	6,017	5,389
Balance at End of Period	2,053	2,821	2,830
Indianapolis Power And Light Company
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	2,821	2,830	2,365
Charged to Income	4,760	6,008	5,854
Net Write-offs	5,528	6,017	5,389
Balance at End of Period	$ 2,053	$ 2,821	$ 2,830