Water And Wastewater Rates (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Indiana And Ohio [Member]
Water And Wastewater Rates [Line Items]
Base rate increase designed to increase total operating revenues on an annual basis	$ 7,403
Illinois And North Carolina [Member]
Water And Wastewater Rates [Line Items]
Infrastructure rehabilitation surcharges	$ 2,031