Water And Wastewater Rates (Details) - USD ($)				9 Months Ended
	May 24, 2019	Apr. 24, 2019	Jan. 01, 2019	Sep. 30, 2019
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)		$ 76,493,000
Base rate increase designed to increase total operating revenues on an annual basis		$ 29,493,000
Increase in water and waster rates		7.50%
Distribution system improvement charges reset level upon new base rates		$ 0
Corporate federal income tax rate				21.00%
Illinois, North Carolina, Ohio, And Pennsylvania [Member]
Water And Wastewater Rates [Line Items]
Infrastructure rehabilitation surcharges				$ 4,531,000
New Jersey [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)			$ 5,000,000
Pennsylvania [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)	$ 47,000,000
Ohio [Member]
Water And Wastewater Rates [Line Items]
Base rate increase (decrease)				$ 974,000