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Benefit Plans (Schedule Of Expected Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Entity Information [Line Items]  
2016 $ 40,598
2017 42,325
2018 43,657
2019 45,077
2020 46,030
2021 through 2025 (in total) 237,296
Indianapolis Power And Light Company [Member]  
Entity Information [Line Items]  
2016 40,598
2017 42,325
2018 43,657
2019 45,077
2020 46,030
2021 through 2025 (in total) $ 237,296