Rate Activity (Narrative) (Details) - USD ($) $ in Thousands									1 Months Ended	9 Months Ended
	Sep. 28, 2023	Jul. 27, 2023	Jun. 05, 2023	Dec. 30, 2022	Sep. 21, 2022	Jun. 07, 2022	May 16, 2022	Jan. 03, 2022	Jan. 31, 2023	Sep. 30, 2023	Feb. 28, 2023
North Carolina [Member]
Water And Wastewater Rates [Line Items]
No refunds of revenue previously billed and collected											$ 0
Illinois [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)										$ 5,022
Texas [Member]
Water And Wastewater Rates [Line Items]
Infrastructure rehabilitation surcharges designed to increase total operating revenues on an annual basis	$ 8,388
Virginia [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)		$ 6,911
Indiana [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)									$ 134
Pennsylvania [Member]
Water And Wastewater Rates [Line Items]
Authorized increase in revenue							$ 69,251
Base rate increase (decrease)							$ 104,721
Base rate increase designed to increase total operating revenues on an annual basis							7.20%			0.00%
Distribution system improvement charges reset level upon new base rates							$ 35,470
Kentucky And Pennsylvania [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)										$ 21,272
Ohio [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)				$ 9,816	$ 5,483				$ 1,569
Kentucky [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)						$ 260		$ 5,238
Year 1 [Member] | North Carolina [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)			$ 14,001
Year 2 [Member] | North Carolina [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)			3,743
Year 3 [Member] | North Carolina [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)			$ 4,130