Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Entity Information [Line Items]
Relating to utility property, net	$ 406,605	$ 378,460
Regulatory assets recoverable through future rates	61,984	67,721
Other	17,996	12,161
Total deferred tax liabilities	486,585	458,342
Investment tax credit	7	11
Regulatory liabilities including ARO	191,676	184,413
Employee benefit plans	8,556	8,335
Other	13,485	12,498
Total deferred tax assets	213,724	205,257
Deferred income taxes – net	272,861	253,085
Indianapolis Power And Light Company
Entity Information [Line Items]
Relating to utility property, net	406,538	378,527
Regulatory assets recoverable through future rates	62,051	67,653
Other	17,547	11,812
Total deferred tax liabilities	486,136	457,992
Investment tax credit	7	11
Regulatory liabilities including ARO	191,676	184,413
Employee benefit plans	8,556	8,335
Other	6,738	12,504
Total deferred tax assets	206,977	205,263
Deferred income taxes – net	$ 279,159	$ 252,729